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O

[edit]
  2. O Street Market
  3. O'Bannon Homestead
  4. O'Bannon Mill
  5. O'Blenis House
  6. O'Brien County Courthouse
  7. O'Brien Electric Priming Company
  8. O'Brien General Store and Post Office
  9. O'Brien–Peuschel Farmstead
  10. O'Connor House (St. Thomas, North Dakota)
  11. O'Connor–Proctor Building
  12. O'Dea House (Berwyn Heights, Maryland)
  13. O'Donel House and Farm
  14. O'Donnell Building
  15. O'Donnell House (Sumter, South Carolina)
  16. O'Fallons Bluff
  17. O'Hanlon Building
  18. O'Hara Waltham Dial factory
  19. O'Kane Building
  20. O'Kane Market and O'Kane Building
  21. O'Kane-Jacobs House
  22. O'Kelly's Chapel
  23. O'Leno State Park
  24. O'Neill Site
  25. O'Reilly House
  26. O'Shaughnessy Dam (Ohio)
  27. O'Shea Building
  28. O. Arthur Kirkman House and Outbuildings
  29. O. B. McFadden House
  30. O. C. Barber Barn No. 1
  31. O. C. Barber Colt Barn
  32. O. C. Barber Creamery
  33. O. C. Barber Machine Barn
  34. O. C. Barber Piggery
  35. O. E. Payne House
  36. O. E. Rolvaag House
  37. O. E. Walker House
  38. O. F. Short House
  39. O. H. Booth Hose Company
  40. O. Henry Hall
  41. O. J. Daniels House
  42. O. K. Palmer House
  43. O. T. Bassett Tower
  44. O. W. Gardner House
  45. O.A.E. Blyberg House
  46. O.B. Grant House
  47. O.D. Gunn Trade and Sale Barn
  48. O.F. and Lulu E. Fryer House
  49. O.H.P. Tanner House
  50. O.J. Walker
  51. O.L. Dunaway House
  52. O.M. Edwards Building
  53. O.P. Wickham House
  54. OK Theatre
  55. OTO Homestead and Dude Ranch
  56. Oahu Railway and Land Company
  57. Oak Alley Plantation
  58. Oak Ballroom
  59. Oak Cemetery
  60. Oak Circle Historic District
  61. Oak City Christian Church
  62. Oak Creek Parkway
  63. Oak Crest
  64. Oak Dell
  65. Oak Flat (Arizona)
  66. Oak Forest (Mechanicsville, Virginia)
  67. Oak Glen (Portsmouth, Rhode Island)
  68. Oak Grove (Altavista, Virginia)
  69. Oak Grove (Church Hill, Mississippi)
  70. Oak Grove (Eastville, Virginia)
  71. Oak Grove (Erwin, North Carolina)
  72. Oak Grove (Hampton County, South Carolina)
  73. Oak Grove (La Plata, Maryland)
  74. Oak Grove (Manakin-Sabot, Virginia)
  75. Oak Grove Butterfield Stage Station
  76. Oak Grove Cemetery (Conway, Arkansas)
  77. Oak Grove Cemetery (Des Arc, Arkansas)
  78. Oak Grove Cemetery (Fall River, Massachusetts)
  79. Oak Grove Cemetery (Falmouth, Massachusetts)
  80. Oak Grove Cemetery (Gloucester, Massachusetts)
  81. Oak Grove Cemetery (New Bedford, Massachusetts)
  82. Oak Grove Community House
  83. Oak Grove Farm
  84. Oak Grove Methodist Church
  85. Oak Grove Missionary Baptist Church
  86. Oak Grove Rosenwald School
  87. Oak Grove School (Grant County, Arkansas)
  88. Oak Grove School (Prairieville, Alabama)
  89. Oak Grove School (Winston-Salem, North Carolina)
  90. Oak Hall (Brentwood, Tennessee)
  91. Oak Hall (Bunkie, Louisiana)
  92. Oak Hall Historic District
  93. Oak Hill (Annandale, Virginia)
  94. Oak Hill (Calvert City, Kentucky)
  95. Oak Hill (Chillicothe, Ohio)
  96. Oak Hill (Colonial Heights, Virginia)
  97. Oak Hill (Cumberland, Virginia)
  98. Oak Hill (Delaplane, Virginia)
  99. Oak Hill (James Monroe house)
  100. Oak Hill (Linlithgo, New York)
  101. Oak Hill Cemetery (Bartow, Florida)
  102. Oak Hill Cemetery (Birmingham, Alabama)
  103. Oak Hill Cemetery (Cedar Rapids, Iowa)
  104. Oak Hill Cemetery (Evansville, Indiana)
  105. Oak Hill Cemetery (Lawrence, Kansas)
  106. Oak Hill Cemetery (Lebanon, Indiana)
  107. Oak Hill Cemetery (Lewistown, Illinois)
  108. Oak Hill Cemetery (Newnan, Georgia)
  109. Oak Hill Cemetery (Oak Hill, New York)
  110. Oak Hill Cemetery (Pontiac, Michigan)
  111. Oak Hill Cemetery Chapel (Bellows Falls, Vermont)
  112. Oak Hill Cemetery Chapel (Washington, D.C.)
  113. Oak Hill Cottage
  114. Oak Hill Country Club
  115. Oak Hill Estate
  116. Oak Hill Farm
  117. Oak Hill Historic District (Fort Dodge, Iowa)
  118. Oak Hill Historic District (Hagerstown, Maryland)
  119. Oak Hill Historic District (Oak Hill, Alabama)
  120. Oak Hill Mausoleum
  121. Oak Hill Methodist Episcopal Church
  122. Oak Hill Park Historic District
  123. Oak Hill School House
  124. Oak Hill Welsh Congregational Church
  125. Oak Hill station
  126. Oak Hills, Oregon
  127. Oak Island (South Carolina)
  128. Oak Island Life Saving Station
  129. Oak Island Light
  130. Oak Knoll (Winchester, Massachusetts)
  131. Oak Lane Historic District
  132. Oak Lawn (Charlottesville, Virginia)
  133. Oak Lawn (Huntsboro, North Carolina)
  134. Oak Lawn (Madison Heights, Virginia)
  135. Oak Lawn (Ridgely, Maryland)
  136. Oak Lawn Farm Dairy Barn
  137. Oak Lawn Methodist Episcopal Church, South
  138. Oak Lodge
  139. Oak Park Conservatory
  140. Oak Park Historic District
  141. Oak Park Village Hall
  142. Oak Place (Huntsville, Alabama)
  143. Oak Plain Presbyterian Church
  144. Oak Ridge (Danville, Virginia)
  145. Oak Ridge Apartments
  146. Oak Ridge Cemetery
  147. Oak Ridge Cemetery (Buchanan, Michigan)
  148. Oak Ridge Historic District
  149. Oak Ridge Military Academy
  150. Oak Ridge Railroad Overpass
  151. Oak Ridge gatehouses
  152. Oak Spring Farm
  153. Oak Square School
  154. Oak Street Garage
  155. Oak Street School (Fulton, New York)
  156. Oak Top
  157. Oakcliff
  158. Oakdale (Floyd, Virginia)
  159. Oakdale (Pennsbury Township, Pennsylvania)
  160. Oakdale Cemetery (Hendersonville, North Carolina)
  161. Oakdale Cotton Mill Village
  162. Oakdale Historic District (Fort Wayne, Indiana)
  163. Oakdale Historic District (Mobile, Alabama)
  164. Oakdale Manor
  165. Oakdale Memorial Gardens
  166. Oakdale Public School
  167. Oakdale School (Madison, Indiana)
  168. Oakdale Village Historic District
  169. Oakdene (Staunton, Virginia)
  170. Oakenshawe Historic District
  171. Oakes Estate
  172. Oakes National Bank Block
  173. Oakes Post Office
  174. Oakes-Wood House
  175. Oakey Streak Methodist Episcopal Church
  176. Oakfield station
  177. Oakforest
  178. Oakham Center Historic District
  179. Oakham Farm
  180. Oakhill (Marshall, Michigan)
  181. Oakhurst (Emelle, Alabama)
  182. Oakhurst Historic District
  183. Oakhurst Links
  184. Oakhurst–Gildersleeve Neighborhood Historic District
  185. Oaklana
  186. Oakland (9 Oakhurst Drive, Natchez, Mississippi)
  187. Oakland (Airlie, North Carolina)
  188. Oakland (Bryantown, Maryland)
  189. Oakland (El Dorado, Arkansas)
  190. Oakland (Gallatin, Tennessee)
  191. Oakland (Montpelier, Virginia)
  192. Oakland (Parkersburg, West Virginia)
  193. Oakland Avenue Historic District
  194. Oakland Cemetery (Atlanta)
  195. Oakland Cemetery (Camden, Arkansas)
  196. Oakland Cemetery (Fort Dodge, Iowa)
  197. Oakland Cemetery (Princeton, Illinois)
  198. Oakland Cemetery (Trenton, Tennessee)
  199. Oakland City Hall
  200. Oakland Farm
  201. Oakland Grove Presbyterian Church
  202. Oakland Hall
  203. Oakland Historic District (Oakland, Maryland)
  204. Oakland Historic District (Oakland, Oregon)
  205. Oakland Hotel
  206. Oakland Memorial Chapel
  207. Oakland Mill
  208. Oakland Mills Blacksmith House and Shop
  209. Oakland Mills Bridge
  210. Oakland Park Elementary School
  211. Oakland Plantation (Beech Island, South Carolina)
  212. Oakland Plantation (Carvers, North Carolina)
  213. Oakland Plantation (Fort Motte, South Carolina)
  214. Oakland Plantation (Natchitoches Parish, Louisiana)
  215. Oakland Plantation (Tarboro, North Carolina)
  216. Oakland Plantation House (Gurley, Louisiana)
  217. Oakland Plantation House (Mount Pleasant, South Carolina)
  218. Oakland Presbyterian Church
  219. Oakland Public Library (Oakland, Maine)
  220. Oakland Public School
  221. Oakland station (Maryland)
  222. Oakland, Rhode Island
  223. Oakland-Fraternal Cemetery
  224. Oaklandon Historic District
  225. Oaklands (Gardiner, Maine)
  226. Oaklands (West Whiteland Township, Pennsylvania)
  227. Oaklands Historic House Museum
  228. Oakland–Dousman Historic District
  229. Oaklawn (Huntsville, Alabama)
  230. Oaklawn Cemetery
  231. Oaklawn Farm
  232. Oaklawn Garden
  233. Oaklawn Manor
  234. Oaklawn Plantation (Natchez, Louisiana)
  235. Oaklawn, Rhode Island
  236. Oakleigh Garden Historic District
  237. Oakleigh Historic Complex (Mobile, Alabama)
  238. Oaklette Historic District
  239. Oakley (Gallatin, Tennessee)
  240. Oakley (Heathsville, Virginia)
  241. Oakley (Spotsylvania County, Virginia)
  242. Oakley (Upperville, Virginia)
  243. Oakley Chapel African Methodist Episcopal Church
  244. Oakley Farm (Warm Springs, Virginia)
  245. Oakley High School Stadium
  246. Oakley Hill
  247. Oakley, Idaho
  248. Oaklyn Plantation
  249. Oakmont (Greenville, North Carolina)
  250. Oakmont Country Club
  251. Oakridge (Blackstone, Virginia)
  252. Oaks Cloister
  253. Oaks Hotel
  254. Oaks II
  255. Oakslea Place
  256. Oakton Gables
  257. Oakton Historic District
  258. Oakton Trolley Station
  259. Oakwood (Fauquier County, Virginia)
  260. Oakwood (Fayette, Missouri)
  261. Oakwood (Gadsden, South Carolina)
  262. Oakwood (Harwood, Maryland)
  263. Oakwood (Wrightstown, New Jersey)
  264. Oakwood Avenue Presbyterian Church
  265. Oakwood Cemetery (Austin, Texas)
  266. Oakwood Cemetery (Fort Worth, Texas)
  267. Oakwood Cemetery (Niagara Falls, New York)
  268. Oakwood Cemetery (Parsons, Kansas)
  269. Oakwood Cemetery (Troy, New York)
  270. Oakwood Cemetery Chapel (Allegan, Michigan)
  271. Oakwood Cemetery Chapel (Cuyahoga Falls, Ohio)
  272. Oakwood Cemetery Mausoleum
  273. Oakwood Estate
  274. Oakwood Historic District (Hickory, North Carolina)
  275. Oakwood Historic District (High Point, North Carolina)
  276. Oakwood–Chimborazo Historic District
  277. Oaky Grove
  278. Oark School-Methodist Church
  279. Oasis Court
  280. Oates Building
  281. Oates House
  282. Oates–Reynolds Memorial Building
  283. Oatlands Historic House & Gardens
  284. Oatman Drug Company Building
  285. Oatman Filling Station
  286. Oats Park Grammar School
  287. Obadiah Smith House
  288. Obediah Barber Homestead
  289. Obediah Farrar House
  290. Obediah Shirley House
  291. Obediah Winston Farm
  292. Oberg-Metcalf House
  293. Oberlin College
  294. Oberlin station
  295. Obidiah Dingee House
  296. Obion County Courthouse
  297. Obion Mounds
  298. Obligation (Harwood, Maryland)
  299. Oblong Friends Meeting House
  300. Observatory Hill Mound Group
  301. Observatory Historic District
  302. Observer Building
  303. Obsidian Cliff
  304. Ocala Historic Commercial District
  305. Ocala Historic District
  306. Ocala Union Station
  307. Occidental Life Building
  308. Occidental Life Insurance Company Building
  309. Occoneechee Speedway
  310. Occoquan Historic District
  311. Occum Hydroelectric Plant and Dam
  312. Ocean City 34th Street Station
  313. Ocean City City Hall
  314. Ocean City Life-Saving Station (New Jersey)
  315. Ocean City Residential Historic District
  316. Ocean City Tenth Street Station
  317. Ocean County Courthouse
  318. Ocean County Jail
  319. Ocean Drive Historic District
  320. Ocean Forest Country Club
  321. Ocean Grove, New Jersey
  322. Ocean Hall
  323. Ocean Park Historic Buildings
  324. Ocean Parkway (Brooklyn)
  325. Ocean Parkway Jewish Center
  326. Ocean Parkway station
  327. Ocean Road Historic District
  328. Ocean Spray Hotel
  329. Ocean Wave (shipwreck)
  330. Ocean to Ocean Bridge
  331. Oceana Neighborhood Historic District
  332. Oceanside City Hall and Fire Station
  333. Ochee Spring Quarry
  334. Ochlocknee Missionary Baptist Church and Cemetery
  335. Ochre Point–Cliffs Historic District
  336. Ocilla Public School
  337. Ocmulgee Mounds National Historical Park
  338. Ocoee Christian Church (Ocoee, Florida)
  339. Ocoee Dam No. 1
  340. Ocoee Dam No. 2
  341. Ocoee Dam No. 3
  342. Ocoee Street Historic District
  343. Oconaluftee (Great Smoky Mountains)
  344. Oconaluftee Baptist Church
  345. Oconee County Cage
  346. Oconee County Courthouse (1956)
  347. Oconee Hill Cemetery
  348. Oconee State Park
  349. Oconee Station State Historic Site
  350. Oconee Street School
  351. Oconomowoc station
  352. Oconto County Courthouse
  353. Ocqueoc Falls Highway–Ocqueoc River Bridge
  354. Ocqueoc Outdoor Center
  355. Ocracoke Historic District
  356. Ocracoke Light
  357. Octagon Barn, Otter Township
  358. Octagon Barn, Richland Township
  359. Octagon Building (Santa Cruz, California)
  360. Octagon Cottage (Rocky Hill, Kentucky)
  361. Octagon Hall
  362. Octagon House (Barrington, Illinois)
  363. Octagon House (Columbus, Georgia)
  364. Octagon House (Danbury, Connecticut)
  365. Octagon House (Fond du Lac, Wisconsin)
  366. Octagon House (Laurens, South Carolina)
  367. Octagon House (Reading, Massachusetts)
  368. Octagon House (Stamford, Connecticut)
  369. Octagon House (Watertown, Wisconsin)
  370. Octagon House (Westfield, Massachusetts)
  371. Octagon Round Barn, Indian Creek Township
  372. Octagon Stone Schoolhouse
  373. Octagonal Poultry House
  374. Octagonal Schoolhouse (Cowgill's Corner, Delaware)
  375. Octagonal Schoolhouse (Essex, New York)
  376. Octonia Stone
  377. Octorara Farm
  378. Odalmelech
  379. Odd Fellows Block (Afton, Iowa)
  380. Odd Fellows Block (Grand Forks, North Dakota)
  381. Odd Fellows Block (Lewiston, Maine)
  382. Odd Fellows Building (Casper, Wyoming)
  383. Odd Fellows Building (Gary, South Dakota)
  384. Odd Fellows Building (Malden, Massachusetts)
  385. Odd Fellows Building (Owensboro, Kentucky)
  386. Odd Fellows Building (Pikeville, Kentucky)
  387. Odd Fellows Building (Portland, Oregon)
  388. Odd Fellows Building (Raleigh, North Carolina)
  389. Odd Fellows Building (Red Bluff, California)
  390. Odd Fellows Building and Auditorium
  391. Odd Fellows Cemetery (Starkville, Mississippi)
  392. Odd Fellows Hall (Alexandria, Virginia)
  393. Odd Fellows Hall (Baltimore, 1891)
  394. Odd Fellows Hall (Beaver, Utah)
  395. Odd Fellows Hall (Big Horn, Wyoming)
  396. Odd Fellows Hall (Blacksburg, Virginia)
  397. Odd Fellows Hall (Cambridge, Massachusetts)
  398. Odd Fellows Hall (Covington, Kentucky)
  399. Odd Fellows Hall (Eureka, California)
  400. Odd Fellows Hall (Gonzales, California)
  401. Odd Fellows Hall (Hilliard, Ohio)
  402. Odd Fellows Hall (La Grange, California)
  403. Odd Fellows Hall (Monticello, Iowa)
  404. Odd Fellows Hall (New York City)
  405. Odd Fellows Hall (Portsmouth, Ohio)
  406. Odd Fellows Hall (Salmon, Idaho)
  407. Odd Fellows Hall (Sandusky, Ohio)
  408. Odd Fellows Hall (Santa Ana, California)
  409. Odd Fellows Hall (Troy Mills, Iowa)
  410. Odd Fellows Home District
  411. Odd Fellows Home of Dell Rapids
  412. Odd Fellows Lodge (Bel Air, Maryland)
  413. Odd Fellows Lodge (Goldsboro, North Carolina)
  414. Odd Fellows Lodge and Temple
  415. Odd Fellows Opera Block
  416. Odd Fellows Rest Cemetery
  417. Odd Fellows Temple (East Liverpool, Ohio)
  418. Odd Fellows Temple (Lexington, Kentucky)
  419. Odd Fellows Temple (Pasadena, California)
  420. Odd Fellows Valley Lodge No. 189 Building
  421. Odd Fellows and Confederate Cemetery
  422. Odd Fellows' Cemetery Mound
  423. Odd Fellows' Hall (Beverly, Massachusetts)
  424. Odd Fellows' Hall (Buckland, Massachusetts)
  425. Odd Fellows' Home (Worcester, Massachusetts)
  426. Odd Fellows' Home for Orphans, Indigent and Aged
  427. Odd Fellows-Rebekah Hall (Cornish, Maine)
  428. Oddfellows Building
  429. Oddfellows Hall (Auburn, California)
  430. Oddfellows Hall (Fairbanks, Alaska)
  431. Oddfellows' Hall (East Providence, Rhode Island)
  432. Odell Building
  433. Odell House
  434. Odell-Locke-Randolph Cotton Mill
  435. Odeon Theater (Tucumcari, New Mexico)
  436. Odessa Historic District
  437. Odessa Ice Cream Company Building
  438. Oeldorf Building
  439. Oella, Maryland
  440. Oesterlein Machine Company-Fashion Frocks, Inc. Complex
  441. Off-the-Neck Historic District
  442. Offerman Building
  443. Office Bridge
  444. Office Hall
  445. Officers Quarters, Washington Navy Yard
  446. Officers Row, Fort Vancouver Barracks
  447. Officers' Row Historic District
  448. Offshore Reefs Archeological District
  449. Offutt Covered Bridge
  450. Oficina de Telégrafo y Teléfono
  451. Ogden Apartment Hotel
  452. Ogden High School
  453. Ogden House (Swarthmore, Pennsylvania)
  454. Ogden Theatre
  455. Ogden-Fettie Site
  456. Ogden/Weber Municipal Building
  457. Ogdensburg Armory
  458. Ogdensburg Harbor Light
  459. Ogilvie Building
  460. Ogilvie Moses Farmhouse
  461. Ogilvie Watertower
  462. Ogle County Courthouse
  463. Oglebay Hall
  464. Oglebay Park
  465. Oglesby-Conrad House
  466. Oglethorpe University
  467. Ogontz Hall
  468. Ogunquit Memorial Library
  469. Ogunquit Playhouse
  470. Ogunquit, Maine
  471. Ohave Shalom Synagogue (Woodridge, New York)
  472. Oheka Castle
  473. Ohev Sholem Synagogue (New London, Connecticut)
  474. Ohev Sholom Temple
  475. Oheyawahi-Pilot Knob
  476. Ohio Baptist General Association Headquarters
  477. Ohio Boulevard–Deming Park Historic District
  478. Ohio City, Cleveland
  479. Ohio Company Land Office
  480. Ohio Farm Bureau Federation Offices
  481. Ohio Finance Building
  482. Ohio Governor's Mansion
  483. Ohio History Center
  484. Ohio Judicial Center
  485. Ohio Military Institute
  486. Ohio Moline Plow Building
  487. Ohio National Bank
  488. Ohio National Guard Armory
  489. Ohio Oil Company Building
  490. Ohio Stadium
  491. Ohio State Normal College at Kent
  492. Ohio State Reformatory
  493. Ohio Statehouse
  494. Ohio Street Bridge
  495. Ohio Street Methodist Episcopal Church Complex
  496. Ohio Theatre (Columbus, Ohio)
  497. Ohio Theatre (Lima, Ohio)
  498. Ohio Theatre (Loudonville, Ohio)
  499. Ohio Theatre (Toledo, Ohio)
  500. Ohio University Lancaster historic bridges
  501. Ohio and Erie Canal
  502. Ohkay Owingeh, New Mexico
  503. Ohlman-Shannon House
  504. Ohringer Building
  505. Oil Capital Historic District (Tulsa, Oklahoma)
  506. Oil City Armory
  507. Oil City Downtown Commercial Historic District
  508. Oil City North Side Historic District
  509. Oil City South Side Historic District
  510. Oil Springs Methodist Church
  511. Oil and Gas Building
  512. Ojibway Fire Tower
  513. Ojo Caliente Hot Springs
  514. Ojo Caliente Hot Springs Round Barn
  515. Okahumpka Rosenwald School
  516. Okeechobee Battlefield
  517. Okehocking Historic District
  518. Oklahoma A & M College Agronomy Barn and Seed House
  519. Oklahoma City Discovery Well
  520. Oklahoma City Ford Motor Company Assembly Plant
  521. Oklahoma City National Memorial
  522. Oklahoma City University
  523. Oklahoma County Courthouse
  524. Oklahoma Judicial Center
  525. Oklahoma Natural Gas Company Building
  526. Oklahoma Odd Fellows Home at Checotah
  527. Oklahoma Presbyterian College
  528. Oklahoma Publishing Company Building
  529. Oklahoma State Capitol
  530. Okmulgee Downtown Historic District
  531. Okmulgee Public Library
  532. Okoboji Bridge
  533. Okolona (Middletown, Delaware)
  534. Okolona College
  535. Okolona Colored High School Gymnasium
  536. Ola Babcock Miller Building
  537. Olaf Lee House
  538. Olaf Stordahl Barn
  539. Olallie Lake Guard Station
  540. Olana State Historic Site
  541. Olcovich–Meyers House
  542. Old Administration Building (Bryce Canyon National Park)
  543. Old Administrative Area Historic District
  544. Old Adobe Barn
  545. Old Albany Academy Building
  546. Old Albany Post Road
  547. Old Albany Schoolhouse
  548. Old Albuquerque Municipal Airport Building
  549. Old Alexander House
  550. Old Allamakee County Courthouse (Lansing, Iowa)
  551. Old Allamakee County Courthouse (Waukon, Iowa)
  552. Old Allegany County Courthouse
  553. Old Allegheny Rows Historic District
  554. Old Alpha Tau Omega Fraternity House (Eugene, Oregon)
  555. Old Alton Bridge
  556. Old Anchorage City Hall
  557. Old Appleton Bridge
  558. Old Arkansas City High School
  559. Old Armijo School
  560. Old Armory (Williston, North Dakota)
  561. Old Asbury Methodist Church
  562. Old Ashland Post Office
  563. Old Ashton Historic District
  564. Old Athens, Alabama Main Post Office
  565. Old Athol High School
  566. Old Attleboro Post Office
  567. Old Auburn Historic District
  568. Old Augusta Historic Site
  569. Old Bacon Academy
  570. Old Baker County Courthouse
  571. Old Baldy (Lynch, Nebraska)
  572. Old Baltimore College of Dental Surgery
  573. Old Bank of America Building (Red Bluff, California)
  574. Old Bank of Amity
  575. Old Bank of Louisville
  576. Old Banks County Courthouse
  577. Old Baptist Parsonage (Scotch Plains, New Jersey)
  578. Old Barn (Canton, Massachusetts)
  579. Old Barnhill Building
  580. Old Barracks Museum
  581. Old Bartow County Courthouse
  582. Old Batesburg Grade School
  583. Old Batesburg-Leesville High School
  584. Old Battle Creek Post Office
  585. Old Bayfield County Courthouse
  586. Old Bayview Cemetery
  587. Old Bedford County Jail
  588. Old Beechwold Historic District
  589. Old Bell Telephone Building (Osceola, Arkansas)
  590. Old Belleair Town Hall
  591. Old Belvidere High School (Belvidere, Illinois)
  592. Old Bend High School
  593. Old Bennington High School
  594. Old Bennington Post Office
  595. Old Bennington, Vermont
  596. Old Benton-Sardis Road Bridge
  597. Old Bergen Church
  598. Old Berkeley City Hall
  599. Old Berkeley County Courthouse (South Carolina)
  600. Old Berlin High School
  601. Old Berrien County Courthouse Complex
  602. Old Berrien County Jail
  603. Old Beta Theta Pi Fraternity House
  604. Old Beth Israel Synagogue (Greenville, South Carolina)
  605. Old Bethany Church
  606. Old Bethel Methodist Church (Arkansas)
  607. Old Bethel United Methodist Church
  608. Old Billerica Road Historic District
  609. Old Bittermann Building
  610. Old Blenheim Bridge
  611. Old Bloomfield
  612. Old Bloomington High School
  613. Old Bluff Presbyterian Church
  614. Old Bnai Zion Synagogue
  615. Old Boardman Bridge
  616. Old Borges Ranch
  617. Old Bourne High School building
  618. Old Bradford County Courthouse
  619. Old Brazoria County Courthouse
  620. Old Brewer High School
  621. Old Brick Church (Athens, Vermont)
  622. Old Brick Church (Bacon's Castle, Virginia)
  623. Old Brick Church (Fairfield County, South Carolina)
  624. Old Brick Church (Iowa City, Iowa)
  625. Old Brick House
  626. Old Brick House (Biloxi, Mississippi)
  627. Old Brick Post Office (Wickenburg, Arizona)
  628. Old Brick Presbyterian Church
  629. Old Brick Store
  630. Old Bridge (unincorporated community), New Jersey
  631. Old Bridgeville Fire House
  632. Old Bristol High School
  633. Old Broad Street Presbyterian Church and Cemetery
  634. Old Broadway Synagogue
  635. Old Brooklyn Fire Headquarters
  636. Old Brown's Mill School
  637. Old Brulay Plantation
  638. Old Brunswick County Courthouse (North Carolina)
  639. Old Bunnell State Bank Building
  640. Old Burying Ground (Beaufort, North Carolina)
  641. Old Burying Ground (Littleton, Massachusetts)
  642. Old Burying Ground (Stoneham, Massachusetts)
  643. Old Burying Ground (Watertown, Massachusetts)
  644. Old Cadillac City Hall
  645. Old Cahokia Courthouse
  646. Old Calaboose
  647. Old Calhoun County Courthouse
  648. Old California City Hall and Fire Station
  649. Old Cambridge Baptist Church
  650. Old Cambridge Historic District
  651. Old Cambridgeport Historic District
  652. Old Camden Post Office
  653. Old Camp Verde
  654. Old Campus District, University of South Carolina
  655. Old Campus Historic District (St. Lawrence University)
  656. Old Cann Mansion House
  657. Old Cape May County Courthouse Building
  658. Old Capitol Building (Olympia, Washington)
  659. Old Castle (Rockport, Massachusetts)
  660. Old Castle Hall
  661. Old Catonsville High School
  662. Old Catonsville Historic District
  663. Old Cawker City Library
  664. Old Cedar Baptist Church
  665. Old Center Burying Yard
  666. Old Central
  667. Old Central Fire Station (North Little Rock, Arkansas)
  668. Old Central Fire Station (Pittsfield, Massachusetts)
  669. Old Central Grammar School
  670. Old Central High School (Kalamazoo, Michigan)
  671. Old Central High School (Pittsfield, Massachusetts)
  672. Old Centre Historic District
  673. Old Challis Historic District
  674. Old Chapel (Amherst, Massachusetts)
  675. Old Chapel (Millwood, Virginia)
  676. Old Chapel Church
  677. Old Chapel Hall
  678. Old Chapel Hill Cemetery
  679. Old Chappaqua Historic District
  680. Old Charles Town Historic District
  681. Old Chattahoochee County Courthouse
  682. Old Cheboygan County Courthouse
  683. Old Chelmsford Garrison House
  684. Old Chestnut Hill Historic District
  685. Old Chicago Main Post Office
  686. Old Chief Joseph Gravesite
  687. Old China Trail
  688. Old Chiswell Place
  689. Old Christ Church (Bethel, Vermont)
  690. Old Christ Church (Laurel, Delaware)
  691. Old Christ Church (Pensacola, Florida)
  692. Old Christiansburg Industrial Institute
  693. Old Churchyard Cemetery
  694. Old Citrus County Courthouse
  695. Old City Cemetery (Columbus, Georgia)
  696. Old City Cemetery (Lynchburg, Virginia)
  697. Old City Hall (Boston)
  698. Old City Hall (Davenport, Iowa)
  699. Old City Hall (Fairbanks, Alaska)
  700. Old City Hall (Gilroy, California)
  701. Old City Hall (Knoxville)
  702. Old City Hall (Lancaster, Pennsylvania)
  703. Old City Hall (Mobile, Alabama)
  704. Old City Hall (Richmond, Virginia)
  705. Old City Hall (St. Charles, Missouri)
  706. Old City Hall (Tacoma, Washington)
  707. Old City Hall (Williamsport, Pennsylvania)
  708. Old City Hall Historic District
  709. Old City Hall and Engine House
  710. Old City Road Stone Arch Bridge
  711. Old City Waterworks
  712. Old City, Philadelphia
  713. Old Clarke County Courthouse (Virginia)
  714. Old Clarksville site
  715. Old Classroom Building, Union College
  716. Old Clay County Courthouse (West Virginia)
  717. Old Clifty Church
  718. Old Clinch County Jail
  719. Old Clinton Historic District
  720. Old Clock at Zion's First National Bank
  721. Old Clovis Post Office
  722. Old Coast Guard Station Manasquan Inlet
  723. Old Cochecton Cemetery
  724. Old Cochrane Road Bridge
  725. Old College Hill Post Office
  726. Old College Historic District
  727. Old Colleton County Jail
  728. Old Collier County Courthouse
  729. Old Colony Cove Site
  730. Old Colony House
  731. Old Colony Iron Works-Nemasket Mills Complex
  732. Old Colorado City
  733. Old Conemaugh Borough Historic District
  734. Old Congregational Church (North Scituate, Rhode Island)
  735. Old Constitution House
  736. Old Cony High School
  737. Old Corinth Cemetery
  738. Old Corner Bookstore
  739. Old Cortez High School
  740. Old County Courthouse
  741. Old County Road South Historic District
  742. Old Courthouse (Buena Vista, Virginia)
  743. Old Courthouse Square (Lake Providence, Louisiana)
  744. Old Covered Bridge
  745. Old Crawfordsville High School
  746. Old Croton Dam
  747. Old Curtisville Historic District
  748. Old Custom House (Cairo, Illinois)
  749. Old Custom House (Monterey, California)
  750. Old Custom House (Yorktown, Virginia)
  751. Old Customs House (Knoxville, Tennessee)
  752. Old Customshouse (Erie, Pennsylvania)
  753. Old Customshouse (Wilmington, Delaware)
  754. Old Danish Church
  755. Old Dauphin Way Historic District
  756. Old Davidson County Courthouse (North Carolina)
  757. Old DeLand Memorial Hospital
  758. Old Deerfield Center Historic District
  759. Old Deerfield School
  760. Old Deery Inn
  761. Old Delta Democrat Times Building
  762. Old Denton
  763. Old Depot Museum
  764. Old Dillard High School
  765. Old District 10 Schoolhouse
  766. Old Donation Episcopal Church
  767. Old Douglas Center Historic District
  768. Old Dowlin Mill
  769. Old Downtown Des Moines Library
  770. Old Downtown Harrisburg Commercial Historic District
  771. Old Drawyers Church
  772. Old Dry Road
  773. Old DuPage County Courthouse
  774. Old Durand High School
  775. Old Dutch Church (Kingston, New York)
  776. Old Dutch Church Parsonage
  777. Old Dutch Church of Sleepy Hollow
  778. Old Dutch Parsonage
  779. Old Eagle Tavern
  780. Old East
  781. Old East Baltimore Historic District
  782. Old East Boston High School
  783. Old East Haven High School
  784. Old East Historic District
  785. Old East Paint Creek Lutheran Church
  786. Old Ebenezer Church
  787. Old Economy Village
  788. Old Eddyville Historic District
  789. Old Effingham County Courthouse
  790. Old Elm Spring Colony, South Dakota
  791. Old Engine Company 26 (Washington, D.C.)
  792. Old Engine Company No. 6
  793. Old Enon Road Stone Arch Culvert
  794. Old Episcopal Manse
  795. Old Essex County Jail
  796. Old Executive Mansion
  797. Old Faithful Historic District
  798. Old Faithful Inn
  799. Old Farm
  800. Old Farm Schoolhouse
  801. Old Fauquier County Jail
  802. Old Federal Building (Anchorage)
  803. Old Federal Building (Fairbanks, Alaska)
  804. Old Federal Building (Sault Ste. Marie)
  805. Old Federal Reserve Bank Building (Philadelphia)
  806. Old Federal Reserve Bank Building (San Francisco)
  807. Old Fellwock Auto Company
  808. Old Fernald-Laughton Memorial Hospital
  809. Old Field Point Light
  810. Old Finnish Lutheran Church
  811. Old Fire Engine House
  812. Old Fire House
  813. Old Fire House No. 4 (Kalamazoo, Michigan)
  814. Old Fire Station (Chester, Illinois)
  815. Old First Church (Huntington, New York)
  816. Old First Methodist Episcopal Church South
  817. Old First National Bank of Prineville
  818. Old First National Bank of Punta Gorda
  819. Old First Presbyterian Church (Kosciusko, Mississippi)
  820. Old First Presbyterian Church (Newark, Delaware)
  821. Old First Presbyterian Church (Newark, New Jersey)
  822. Old First Presbyterian Church (Wilmington, Delaware)
  823. Old First Reformed Church (Brooklyn)
  824. Old Florence Water Tower
  825. Old Ford Dairy
  826. Old Forge Farm
  827. Old Forge Farm (Middletown, Virginia)
  828. Old Fort (Miami, Missouri)
  829. Old Fort Bliss
  830. Old Fort Braden School
  831. Old Fort Church
  832. Old Fort Commercial Historic District
  833. Old Fort Harrod State Park
  834. Old Fort House (Columbus, Mississippi)
  835. Old Fort House (Fort Edward, New York)
  836. Old Fort Johnson
  837. Old Fort Madison High School
  838. Old Fort Park Archeological Site
  839. Old Fort Park and Golf Course
  840. Old Fort Pierce City Hall
  841. Old Fort Pierce Park
  842. Old Fort Pierce Post Office
  843. Old Fourth Ward Historic District
  844. Old Fourth Ward Southeast Historic District
  845. Old Frankfort Stone High School
  846. Old Franklin United Brethren Church
  847. Old Fremont Post Office
  848. Old Fresno Water Tower
  849. Old Friends Archeological Site
  850. Old Friendship United Methodist Church
  851. Old Frio County Jail
  852. Old Frostproof High School
  853. Old Gaissert Homeplace
  854. Old Garfield School (Salem, Oregon)
  855. Old Garrard County Jail
  856. Old Garrison House
  857. Old Georgetown City Hall
  858. Old Georgetown Road (Charleston County, South Carolina)
  859. Old Gerald School
  860. Old German Baptist Brethren Church (Winston-Salem)
  861. Old Germantown Academy and Headmasters' Houses
  862. Old Gillett Jail
  863. Old Girard High School
  864. Old Gothic Barns
  865. Old Goucher College Buildings
  866. Old Government House (Augusta, Georgia)
  867. Old Governor's Mansion (Frankfort, Kentucky)
  868. Old Governor's Mansion (Milledgeville, Georgia)
  869. Old Grace Episcopal Church Rectory
  870. Old Grafton County Courthouse
  871. Old Grand Rapids Christian High School
  872. Old Grandin Library
  873. Old Gravesend Cemetery
  874. Old Gray Cemetery
  875. Old Gray County Courthouse
  876. Old Gray House
  877. Old Grayson County Courthouse and Clerk's Office
  878. Old Greencastle Historic District
  879. Old Greene County Courthouse
  880. Old Greenville (23WE637)
  881. Old Greenwich station
  882. Old Greenwood Cemetery
  883. Old Greenwood High School
  884. Old Grist Mill
  885. Old Guaranty Bank Building
  886. Old Gym (Vanderbilt University)
  887. Old Haines City National Guard Armory
  888. Old Hall County Courthouse (Georgia)
  889. Old Hamilton County Jail
  890. Old Hamilton Library
  891. Old Hampden Academy Building
  892. Old Hancock Central High School
  893. Old Hancock County Buildings
  894. Old Hanover High School
  895. Old Hansen Planetarium
  896. Old Harbor Historic District
  897. Old Harbor Reservation Parkways
  898. Old Harbor U.S. Life Saving Station
  899. Old Hardy County Courthouse
  900. Old Harrison County Courthouse (Iowa)
  901. Old Harrison County Courthouse (Texas)
  902. Old Hartwick Village Cemetery
  903. Old Hattiesburg High School
  904. Old Hawleyton Methodist Episcopal Church
  905. Old Headquarters Area Historic District
  906. Old Heidelberg Apartments
  907. Old Hemlock
  908. Old Hendry County Courthouse
  909. Old Hernando Elementary School
  910. Old Hickman Historic District
  911. Old Hickory United Methodist Church
  912. Old Higgins Farm Windmill
  913. Old High Middle School (Bentonville, Arkansas)
  914. Old Highway 16 Bridge
  915. Old Hill Place Bridge
  916. Old Holy Redeemer Catholic Church
  917. Old Homer Village Historic District
  918. Old Homestead (Aberdeen, Mississippi)
  919. Old Homestead (Enon Valley, Pennsylvania)
  920. Old Hoopes School
  921. Old Horry County Courthouse
  922. Old Hose House
  923. Old Hotel (Dumfries, Virginia)
  924. Old House (Cutchogue)
  925. Old House Plantation
  926. Old Huntington High School
  927. Old Huntington Jail
  928. Old Idaho State Penitentiary
  929. Old Indian Cemetery
  930. Old Indian Meeting House
  931. Old Indian River County Courthouse
  932. Old Indiana County Courthouse
  933. Old Indiana County Jail and Sheriff's Office
  934. Old Indianapolis City Hall
  935. Old Irion County Courthouse
  936. Old Iron Bridge (Bastrop, Texas)
  937. Old Iron County Courthouse
  938. Old Irontown, Utah
  939. Old Iroquois County Courthouse
  940. Old Isle of Wight Courthouse
  941. Old Jacoby Creek School
  942. Old Jail (Barnstable, Massachusetts)
  943. Old Jail (Gordo, Alabama)
  944. Old Jail (Muscatine, Iowa)
  945. Old Jail (Washington, Georgia)
  946. Old Jefferson Parish Courthouse
  947. Old Jeffersonville Historic District
  948. Old Joe (Norfork, Arkansas)
  949. Old Judy Church
  950. Old Kennebunk High School
  951. Old Kennett Meetinghouse
  952. Old Kentuck
  953. Old Kentucky Turnpike Historic District
  954. Old Killingly High School
  955. Old King's Highway Historic District
  956. Old Kingsport Presbyterian Church
  957. Old Korean Legation Museum
  958. Old LSU Site
  959. Old La Grange Schoolhouse
  960. Old Ladore School
  961. Old Lafayette City Hall
  962. Old Lake County Courthouse (California)
  963. Old Lake County Courthouse (Florida)
  964. Old Lake Worth City Hall
  965. Old Lakeland High School
  966. Old Las Vegas Mormon Fort State Historic Park
  967. Old Laurel High School
  968. Old Lee County Courthouse
  969. Old Lehigh County Courthouse
  970. Old Lenox High School building
  971. Old Library (Bryn Mawr College)
  972. Old Library Building (Chattanooga, Tennessee)
  973. Old Library Building (Maysville, Kentucky)
  974. Old Linn County Jail
  975. Old Little Rock Central Fire Station
  976. Old Live Oak City Hall
  977. Old Livery Stable
  978. Old Livingston Parish Courthouse
  979. Old Lock Pump House, Chesapeake & Delaware Canal
  980. Old Log Church
  981. Old Logan County Courthouse (Kansas)
  982. Old Logan County Jail
  983. Old Lone Star Brewery
  984. Old Lordsburg High School
  985. Old Lorimier Cemetery
  986. Old Louisiana Governor's Mansion
  987. Old Louisiana State Capitol
  988. Old Louisville
  989. Old Lucerne Historic Residential District
  990. Old Lutheran Parsonage
  991. Old Lutz Elementary School
  992. Old Lyford High School
  993. Old Lyme Historic District
  994. Old Lynn High School
  995. Old M-94–Au Train River Bridge
  996. Old M-95–Michigamme River Bridge
  997. Old Mackinac Point Light
  998. Old Madison County Courthouse
  999. Old Maid's Orchard Mound
  1000. Old Main (Arizona State University)
  1001. Old Main (Augsburg University)
  1002. Old Main (Bethany College)
  1003. Old Main (California University of Pennsylvania)
  1004. Old Main (Dakota College at Bottineau)
  1005. Old Main (Eastern Illinois University)
  1006. Old Main (Franklin College)
  1007. Old Main (Iowa Wesleyan University)
  1008. Old Main (Marshall University)
  1009. Old Main (Minnesota State University, Mankato)
  1010. Old Main (Nicholas County High School)
  1011. Old Main (North Park University)
  1012. Old Main (Texas State University)
  1013. Old Main (University of Arkansas)
  1014. Old Main (University of North Carolina at Pembroke)
  1015. Old Main (University of South Dakota)
  1016. Old Main (University of Wyoming)
  1017. Old Main (Utah State University)
  1018. Old Main (Wartburg College)
  1019. Old Main (Western Washington University)
  1020. Old Main Library (Albuquerque, New Mexico)
  1021. Old Main Street Historic District (Dubuque, Iowa)
  1022. Old Main Street Historic District (Racine, Wisconsin)
  1023. Old Main and Chemistry Building
  1024. Old Main at the Lutheran Home at Topton
  1025. Old Main, Augustana College
  1026. Old Main, Goethean Hall, and Diagnothian Hall
  1027. Old Main, Knox College
  1028. Old Main, Nebraska Wesleyan University
  1029. Old Main, Suomi College
  1030. Old Main, University of Arizona
  1031. Old Man House
  1032. Old Manatee County Courthouse
  1033. Old Mandan High School
  1034. Old Mansion
  1035. Old Marengo County Courthouse
  1036. Old Marion County Courthouse (Georgia)
  1037. Old Market (Louisville, Georgia)
  1038. Old Market (Omaha, Nebraska)
  1039. Old Market Building (Georgetown, South Carolina)
  1040. Old Market House (Galena, Illinois)
  1041. Old Martin County Courthouse
  1042. Old Masonic Hall (Bellville, Texas)
  1043. Old Masonic Hall (Benicia, California)
  1044. Old Masonic Hall (Louisville, Mississippi)
  1045. Old Masonic Temple (Marshall, Minnesota)
  1046. Old Mauch Chunk Historic District
  1047. Old McCulloch County Jail
  1048. Old McDonald County Courthouse
  1049. Old McHenry County Courthouse
  1050. Old McKenzie Fish Hatchery
  1051. Old McKinley High School
  1052. Old Medford High School
  1053. Old Medical College Building
  1054. Old Meigs County Courthouse
  1055. Old Merchants and Farmers Bank Building
  1056. Old Methodist District Parsonage
  1057. Old Michigan Avenue School
  1058. Old Michigan City Light
  1059. Old Middletown High School
  1060. Old Middletown Post Office
  1061. Old Midtown Historic District (Harrisburg)
  1062. Old Military Road
  1063. Old Mill (West Tisbury, Massachusetts)
  1064. Old Mill House
  1065. Old Mill Road Bridge
  1066. Old Mill Site Historic District
  1067. Old Mill State Park
  1068. Old Mill at Tinton Falls
  1069. Old Miller Hospital
  1070. Old Mine Park Archeological Site
  1071. Old Mine Road Historic District
  1072. Old Minnehaha County Courthouse
  1073. Old Mishawaka Carnegie Library
  1074. Old Mission Dam
  1075. Old Mission House
  1076. Old Mission Inn
  1077. Old Mission State Park
  1078. Old Mississippi State Capitol
  1079. Old Mobile Site
  1080. Old Monroe County Courthouse
  1081. Old Monroe School House
  1082. Old Morris County Courthouse
  1083. Old Morrison Mill
  1084. Old Mt. Carmel Cemetery, Wrought-Iron Cross Site
  1085. Old Muhlenberg County Jail
  1086. Old Mulkey Meetinghouse
  1087. Old Napa Register Building
  1088. Old Narragansett Cemetery
  1089. Old Narragansett Church
  1090. Old Nassau County Courthouse (New York)
  1091. Old Natchez Trace segments listed on the National Register of Historic Places
  1092. Old National Park Service Housing Historic District
  1093. Old National Pike Milestones
  1094. Old Naval Hospital
  1095. Old Naval Observatory
  1096. Old Nazareth Academy
  1097. Old Nebraska State Bank Building
  1098. Old Neck Historic District
  1099. Old Neighborhoods Historic District
  1100. Old New England Building
  1101. Old New York Evening Post Building
  1102. Old New-Gate Prison
  1103. Old Newark Comprehensive School
  1104. Old Newberry County Courthouse
  1105. Old Newburgh Presbyterian Church
  1106. Old Nogales City Hall and Fire Station
  1107. Old Norfolk City Hall
  1108. Old Norriton Presbyterian Church
  1109. Old North Carolina Mutual Life Insurance Company Building
  1110. Old North Cemetery (Concord, New Hampshire)
  1111. Old North Cemetery (Hartford, Connecticut)
  1112. Old North Cemetery (Portsmouth, New Hampshire)
  1113. Old North Cemetery (Truro, Massachusetts)
  1114. Old North Church
  1115. Old North End Historic District (Colorado Springs, Colorado)
  1116. Old North End Historic District (Columbus, Ohio)
  1117. Old North Knoxville
  1118. Old North Tower, University of Central Oklahoma
  1119. Old North Yakima Historic District
  1120. Old Northside Historic District
  1121. Old Northwood Historic District
  1122. Old Nueces County Courthouse
  1123. Old Oak
  1124. Old Ohavi Zedek Synagogue
  1125. Old Orange County Courthouse (California)
  1126. Old Orange County Courthouse (North Carolina)
  1127. Old Orchard Beach Inn
  1128. Old Orchard Shoal Light
  1129. Old Oxford Mill
  1130. Old Ozaukee County Courthouse
  1131. Old Palm Beach Junior College Building
  1132. Old Palmetto Hotel
  1133. Old Parsonage
  1134. Old Pasadena
  1135. Old Pascagoula High School
  1136. Old People's Home (Omaha)
  1137. Old People's Home (Tampa, Florida)
  1138. Old Perry County Courthouse (Rome, Indiana)
  1139. Old Perry Post Office
  1140. Old Petaluma Opera House
  1141. Old Philadelphia Presbyterian Church
  1142. Old Pickens Jail
  1143. Old Pickens Presbyterian Church
  1144. Old Piedras River Aqueduct
  1145. Old Pike Inn
  1146. Old Pilgrim Baptist Church Cemetery and Kilgore Family Cemetery
  1147. Old Pine Church
  1148. Old Pine Street Station
  1149. Old Pinecrest Hotel
  1150. Old Pinellas County Courthouse
  1151. Old Piqua High School
  1152. Old Plat Historic District
  1153. Old Platte Clove Post Office
  1154. Old Plover Methodist Church
  1155. Old Point Comfort Light
  1156. Old Point Loma Lighthouse
  1157. Old Police Headquarters
  1158. Old Polk County Courthouse (Florida)
  1159. Old Port Columbus Terminal
  1160. Old Port of Portland, Maine
  1161. Old Portlock School No. 5
  1162. Old Post Office (Albany, New York)
  1163. Old Post Office (Albuquerque, New Mexico)
  1164. Old Post Office (Augusta, Maine)
  1165. Old Post Office (Biddeford, Maine)
  1166. Old Post Office (Buffalo, New York)
  1167. Old Post Office (Hot Springs, Arkansas)
  1168. Old Post Office (Iowa City, Iowa)
  1169. Old Post Office (Kirkwood, Delaware)
  1170. Old Post Office (Liberty, Maine)
  1171. Old Post Office (Oneonta, New York)
  1172. Old Post Office (Pullman, Washington)
  1173. Old Post Office (Rogers, Arkansas)
  1174. Old Post Office (Washington, D.C.)
  1175. Old Post Office (Watertown, South Dakota)
  1176. Old Post Office Block
  1177. Old Post Office Building (Brockton, Massachusetts)
  1178. Old Post Office Building (Lynn, Massachusetts)
  1179. Old Post Office Building and Customhouse (Little Rock, Arkansas)
  1180. Old Post Office and Courthouse (Auburn, New York)
  1181. Old Post Office and Customshouse (Key West, Florida)
  1182. Old Pottstown Historic District
  1183. Old Poughkeepsie YMCA
  1184. Old Presbyterian Church (Barnwell, South Carolina)
  1185. Old Presbyterian Church (Parker, Arizona)
  1186. Old Presbyterian Meeting House
  1187. Old Presque Isle Light
  1188. Old Prince Edward County Clerk's Office
  1189. Old Probst Church
  1190. Old Providence Church
  1191. Old Providence Presbyterian Church
  1192. Old Providence Stone Church
  1193. Old Public Library
  1194. Old Quaker Meeting House (Queens)
  1195. Old Queens
  1196. Old Randolph County Courthouse (Arkansas)
  1197. Old Rectory (Perrowville, Virginia)
  1198. Old Red Mill
  1199. Old Red Mill and Mill House
  1200. Old Redfield City Hall
  1201. Old Redwater Bridge
  1202. Old Richmond Historic District
  1203. Old Richmond Schoolhouse and Gymnasium
  1204. Old River Bridge
  1205. Old Riverton Inn
  1206. Old Roanoke County Courthouse
  1207. Old Rock House (Harpersville, Alabama)
  1208. Old Rock House (Moscow Mills, Missouri)
  1209. Old Rock House (Thomson, Georgia)
  1210. Old Rock School (Dodgeville, Wisconsin)
  1211. Old Rock School (Guntersville, Alabama)
  1212. Old Rock School (Prairie du Chien, Wisconsin)
  1213. Old Rockport High School
  1214. Old Rockport Hutterite Colony
  1215. Old Rockville High School and East School
  1216. Old Rondo Cemetery
  1217. Old Rose Tree Tavern
  1218. Old Rotation
  1219. Old Runnymede Church
  1220. Old Russell County Courthouse
  1221. Old Ryan Farm
  1222. Old Saco High School
  1223. Old Sacramento State Historic Park
  1224. Old Saint Hilary's Church
  1225. Old Saint John Nepomocene Cemetery, Wrought-Iron Cross Site
  1226. Old Saint Paul's Cemetery
  1227. Old Saints Peter and Paul Cemetery, Wrought-Iron Cross Site
  1228. Old Salem
  1229. Old Salem Church and Cemetery
  1230. Old San Antonio City Cemeteries Historic District
  1231. Old San Antonio Hospital
  1232. Old San Francisco Mint
  1233. Old San Juan
  1234. Old Santa Rosa Catholic Church and Cemetery
  1235. Old Santa Susana Stage Road
  1236. Old Saratoga Reformed Church
  1237. Old Sardinia Town Hall
  1238. Old Savonoski Site
  1239. Old Saybrook South Green
  1240. Old Scarborough High School
  1241. Old School Baptist Church and Cemetery
  1242. Old School Baptist Church of Halcottsville
  1243. Old School House (Tampa, Florida)
  1244. Old School Privy
  1245. Old School Square
  1246. Old Schoolhouse (York, Maine)
  1247. Old Schoolhouse Bridge
  1248. Old Schwamb Mill
  1249. Old Scituate Light
  1250. Old Scotch Church
  1251. Old Scots Burying Ground
  1252. Old Scott County Jail
  1253. Old Scottish Rite Hospital building
  1254. Old Scripps Building
  1255. Old Searcy County Jail
  1256. Old Sebastian County Jail
  1257. Old Second National Bank
  1258. Old Seminary Building
  1259. Old Settler's Irrigation Ditch
  1260. Old Settler's Pavilion
  1261. Old Settlers' Association Park and Rhodham Bonnifield House
  1262. Old Settlers' Association of Johnson County Cabins
  1263. Old Settlers' Burying Ground
  1264. Old Shandon Historic District
  1265. Old Shelby County Courthouse
  1266. Old Sheldon Church Ruins
  1267. Old Shephard Farm
  1268. Old Ship African Methodist Episcopal Zion Church
  1269. Old Ship Church
  1270. Old Ship Street Historic District
  1271. Old Shipbuilder's Historic District
  1272. Old Silk Stocking Neighborhood
  1273. Old Sinclair Station
  1274. Old Sitka Site
  1275. Old Slave Mart
  1276. Old Sloatsburg Cemetery
  1277. Old Somersworth High School
  1278. Old Sopchoppy High School Gymnasium
  1279. Old South Church
  1280. Old South Church (Kirtland, Ohio)
  1281. Old South Mebane Historic District
  1282. Old South Meeting House
  1283. Old South Union Church
  1284. Old Southeast Church (Brewster, New York)
  1285. Old Southeast Town Hall
  1286. Old Southport High School
  1287. Old Spanish Fort (Pascagoula, Mississippi)
  1288. Old Spanish Trail (trade route)
  1289. Old Spink Colony
  1290. Old Spring Tavern
  1291. Old Springdale High School
  1292. Old St. Anastasia Catholic School
  1293. Old St. Andrew's Episcopal Church
  1294. Old St. Andrew's Parish Church
  1295. Old St. Anthony's Catholic Church (Violet, Texas)
  1296. Old St. Ferdinand Shrine
  1297. Old St. Gabriel's Episcopal Church
  1298. Old St. Helena Parish Jail
  1299. Old St. Johns County Jail
  1300. Old St. Joseph Hospital
  1301. Old St. Joseph's Catholic Church
  1302. Old St. Luke's Episcopal Church (Belton, Texas)
  1303. Old St. Luke's Hospital
  1304. Old St. Mary's Catholic Parish House
  1305. Old St. Mary's Cemetery, Wrought-Iron Cross Site
  1306. Old St. Mary's Church (Cincinnati, Ohio)
  1307. Old St. Mary's Church (Milwaukee, Wisconsin)
  1308. Old St. Mary's Church (Tempe, Arizona)
  1309. Old St. Nicholas Russian Orthodox Church
  1310. Old St. Patrick's Church (Chicago)
  1311. Old St. Patrick's Church (Gravois Mills, Missouri)
  1312. Old St. Paul's Methodist Episcopal Church
  1313. Old St. Peter's Church (Van Cortlandtville, New York)
  1314. Old St. Peter's Landmark
  1315. Old St. Raymond's Church
  1316. Old St. Teresa Catholic Church
  1317. Old St. Wenceslaus Catholic Parish House
  1318. Old Stagecoach Stop
  1319. Old State Bank (Decatur, Alabama)
  1320. Old State Bank (Vincennes, Indiana)
  1321. Old State Capitol (Kentucky)
  1322. Old State Capitol (Milledgeville, Georgia)
  1323. Old State Capitol State Historic Site
  1324. Old State House (Boston)
  1325. Old State House (Connecticut)
  1326. Old State House (Dover, Delaware)
  1327. Old State House (Little Rock, Arkansas)
  1328. Old State House (Providence, Rhode Island)
  1329. Old State Mutual Building
  1330. Old State Quarry State Preserve
  1331. Old State Road Bridge
  1332. Old Statehouse Historic District (Frankfort, Kentucky)
  1333. Old Stone Arch (Marshall, Illinois)
  1334. Old Stone Arch Bridge (Bound Brook, New Jersey)
  1335. Old Stone Arch Bridge (Clark Center, Illinois)
  1336. Old Stone Arch Bridge (Lewistown, Pennsylvania)
  1337. Old Stone Barracks
  1338. Old Stone Blacksmith Shop
  1339. Old Stone Church (Buffalo, North Dakota)
  1340. Old Stone Church (Chesterfield, Missouri)
  1341. Old Stone Church (Cleveland, Ohio)
  1342. Old Stone Church (Kingwood Township, New Jersey)
  1343. Old Stone Church (Lewisburg, West Virginia)
  1344. Old Stone Church (West Boylston, Massachusetts)
  1345. Old Stone Church (White Hall, Virginia)
  1346. Old Stone Church (Winchester, Virginia)
  1347. Old Stone Church Archeological Site
  1348. Old Stone Church and Cemetery
  1349. Old Stone Congregational Church
  1350. Old Stone Fort (Schoharie, New York)
  1351. Old Stone Fort (Tennessee)
  1352. Old Stone Hotel
  1353. Old Stone House (Brooklyn)
  1354. Old Stone House (Millboro Springs, Virginia)
  1355. Old Stone House (Morgantown, West Virginia)
  1356. Old Stone House (Pennsboro, West Virginia)
  1357. Old Stone House (Vale, Oregon)
  1358. Old Stone House (Washington, D.C.)
  1359. Old Stone House (Winnsboro, South Carolina)
  1360. Old Stone House (Winooski, Vermont)
  1361. Old Stone House Library
  1362. Old Stone Row
  1363. Old Stone Shop
  1364. Old Stone Tavern (Atkins, Virginia)
  1365. Old Stone Tavern (Frankfort, Kentucky)
  1366. Old Stone Tavern (Little Creek, Delaware)
  1367. Old Stone Tavern (Moorefield, West Virginia)
  1368. Old Stone Warehouse (Rochester, New York)
  1369. Old Stone Wharf Archeological Site
  1370. Old Storm Lake High School
  1371. Old Strother Place
  1372. Old Sugar Mill of Koloa
  1373. Old Sullivan County Courthouse
  1374. Old Sussex County Courthouse
  1375. Old Sutton High School
  1376. Old Talbott Tavern
  1377. Old Tampa Children's Home
  1378. Old Tarpon Springs City Hall
  1379. Old Tarpon Springs High School
  1380. Old Tavern (Burlington, Maine)
  1381. Old Tavern (Sacramento, California)
  1382. Old Tavern Farm
  1383. Old Taylor County Jail
  1384. Old Thames Shipyard
  1385. Old Third District Courthouse
  1386. Old Thomas James Store
  1387. Old Timbers
  1388. Old Todd County Courthouse
  1389. Old Tombstone
  1390. Old Town (Franklin, Tennessee)
  1391. Old Town Bridge (Franklin, Tennessee)
  1392. Old Town Bridge (Wayland, Massachusetts)
  1393. Old Town Cemetery (Newburgh, New York)
  1394. Old Town Center Historic District
  1395. Old Town College Park
  1396. Old Town Eureka
  1397. Old Town Farm
  1398. Old Town Fort Collins
  1399. Old Town Friends' Meetinghouse
  1400. Old Town Green Historic District
  1401. Old Town Hall (Athol, Massachusetts)
  1402. Old Town Hall (Chester, Connecticut)
  1403. Old Town Hall (Pittsfield, Massachusetts)
  1404. Old Town Hall (Stamford, Connecticut)
  1405. Old Town Hall (Tyngsborough, Massachusetts)
  1406. Old Town Hall (Wilmington, Delaware)
  1407. Old Town Hall Historic District (Duxbury, Massachusetts)
  1408. Old Town Hall Historic District (Huntington, New York)
  1409. Old Town Hall and School
  1410. Old Town Historic District (Ames, Iowa)
  1411. Old Town Historic District (Clearfield, Pennsylvania)
  1412. Old Town Historic District (Harrisonburg, Virginia)
  1413. Old Town Historic District (Hartford, Kentucky)
  1414. Old Town Historic District (Huntsville, Alabama)
  1415. Old Town Historic District (North Attleborough, Massachusetts)
  1416. Old Town Historic District (Selma, Alabama)
  1417. Old Town House (Marblehead, Massachusetts)
  1418. Old Town House (Parsonsfield, Maine)
  1419. Old Town House (Union, Maine)
  1420. Old Town Main Post Office
  1421. Old Town Manassas
  1422. Old Town Plantation
  1423. Old Town Residential Historic District (Las Vegas, New Mexico)
  1424. Old Town San Diego State Historic Park
  1425. Old Town Savings Bank
  1426. Old Town Sebastian Historic District, East
  1427. Old Town Sebastian Historic District, West
  1428. Old Town of Flushing Burial Ground
  1429. Old Town, Chicago
  1430. Old Town, Lansing, Michigan
  1431. Old Towne, Orange Historic District
  1432. Old Trail School (Wiggins, Colorado)
  1433. Old Trails Bridge
  1434. Old Trees
  1435. Old Turner Place
  1436. Old Turrell City Hall
  1437. Old U.S. Forest Products Laboratory
  1438. Old U.S. Post Office (Bend, Oregon)
  1439. Old U.S. Post Office (Marion, Ohio)
  1440. Old U.S. Post Office (Niles, Michigan)
  1441. Old U.S. Post Office (Ripley, Mississippi)
  1442. Old U.S. Post Office (Williston, North Dakota)
  1443. Old U.S. Route 79 (Kingsland, Arkansas)
  1444. Old US 41–Backwater Creek Bridge
  1445. Old US 67 Rest Area
  1446. Old Union Church and Cemetery
  1447. Old Union County Courthouse (Georgia)
  1448. Old Union County Courthouse (Pennsylvania)
  1449. Old Union County Jail (Blairsville, Georgia)
  1450. Old Union Depot Hotel
  1451. Old Union Meetinghouse
  1452. Old Union Methodist Church
  1453. Old Union School (Birdell, Arkansas)
  1454. Old Union School (Chesterville, Ohio)
  1455. Old Union School (Coshocton, Ohio)
  1456. Old United States Courthouse and Post Office (Frankfort, Kentucky)
  1457. Old United States Customshouse and Post Office and Fireproof Storage Company Warehouse
  1458. Old United States Post Office (Philadelphia, Mississippi)
  1459. Old United States Post Office and Courthouse (Miami, Florida)
  1460. Old United States Post Office and Courts Building (Jefferson, Texas)
  1461. Old University Library
  1462. Old University of Alabama Observatory
  1463. Old Upper Springfield Friends Burying Ground
  1464. Old Uptown Historic District (Harrisburg)
  1465. Old Urban Cemetery
  1466. Old Ursuline Convent, New Orleans
  1467. Old Vanderburgh County Courthouse
  1468. Old Vatia
  1469. Old Vero Beach Community Building
  1470. Old Vicksburg Bridge
  1471. Old Village Historic District (Chatham, Massachusetts)
  1472. Old Village Historic District (Monroe, Michigan)
  1473. Old WRUF Radio Station
  1474. Old Wadena Historic District
  1475. Old Wakulla County Courthouse
  1476. Old Walnut Ridge Post Office
  1477. Old Wappingers Falls Village Hall
  1478. Old Warner Brothers Studio
  1479. Old Warren County Courthouse
  1480. Old Warren County Courthouse Complex
  1481. Old Warrick County Jail
  1482. Old Washington County Courthouse (Oklahoma)
  1483. Old Washington County Courthouse (Utah)
  1484. Old Washington County Library
  1485. Old Water and Electric Light Plant
  1486. Old Watertown High School
  1487. Old Waterville High School
  1488. Old Waterville Post Office
  1489. Old Watson Homestead House
  1490. Old Wayne County High School
  1491. Old Weber Implement and Automobile Company
  1492. Old Webster Meeting House
  1493. Old Webster Schoolhouse
  1494. Old Weir Stove Building
  1495. Old Welbourne Farm and Dulany Family Cemetery
  1496. Old West Austin Historic District
  1497. Old West Baltimore Historic District
  1498. Old West Church (Boston, Massachusetts)
  1499. Old West Church (Calais, Vermont)
  1500. Old West End District (Toledo, Ohio)
  1501. Old West End Historic District (Muncie, Indiana)
  1502. Old West Haven High School
  1503. Old West Palm Beach National Guard Armory
  1504. Old West Salem City Hall
  1505. Old West Side Historic District
  1506. Old West, Dickinson College
  1507. Old Westbrook High School
  1508. Old Westbury Gardens
  1509. Old Westfield Cemetery
  1510. Old Wethersfield
  1511. Old Whaler's Church (Sag Harbor)
  1512. Old White Church Cemetery
  1513. Old White County Courthouse
  1514. Old White Meeting House Ruins and Cemetery
  1515. Old White Mill
  1516. Old Wilkes County Jail
  1517. Old Willow Community Center
  1518. Old Wilson Historic District
  1519. Old Wing Mission
  1520. Old Winona Middle School
  1521. Old Winters Ranch/Winters Mansion
  1522. Old Woodruff High School (Woodruff, South Carolina)
  1523. Old World Third Street Historic District
  1524. Old Worth County Courthouse (Iowa)
  1525. Old Wye Church
  1526. Old Wythe Historic District
  1527. Old York Gaol
  1528. Old Zion Methodist Church
  1529. Olde Town Arvada
  1530. Olde Woolen Mill
  1531. Oldenburg Historic District
  1532. Oldfields
  1533. Oldham Methodist Church
  1534. Olds Hall
  1535. Olds, Wortman & King
  1536. Oldtown Covered Bridge
  1537. Oldwick Historic District
  1538. Ole Arilsen House
  1539. Ole Bohman House
  1540. Ole Carlson House
  1541. Ole Crogen Farm District
  1542. Ole K. Roe House
  1543. Ole and Polly Oleson Farmhouse
  1544. Olean Armory
  1545. Olean Public Library
  1546. Olean Railroad Depot
  1547. Olean School No. 10
  1548. Olema Lime Kilns
  1549. Olema Valley Dairy Ranches Historic District
  1550. Oleson Park Music Pavilion
  1551. Oley Township, Pennsylvania
  1552. Oliphant–Walker House
  1553. Olivas Adobe
  1554. Olive Branch High School (New Carlisle, Ohio)
  1555. Olive Branch Methodist Episcopal Church
  1556. Olive Branch Missionary Baptist Church
  1557. Olive Chapel African Methodist Episcopal Church
  1558. Olive Furnace
  1559. Olive Hill (Matoaca, Virginia)
  1560. Olive Hill station
  1561. Olive Hotel
  1562. Olive Jeanette
  1563. Olive Township District No. 1 School
  1564. Olive and Hurley Old School Baptist Church
  1565. Olivenhain Town Meeting Hall
  1566. Oliver A. Wickes House
  1567. Oliver Avenue Bridge
  1568. Oliver Barrett House
  1569. Oliver Blood House
  1570. Oliver Brewster House
  1571. Oliver Bronson House
  1572. Oliver Building (Billings, Montana)
  1573. Oliver Building (Chicago)
  1574. Oliver Chace's Thread Mill
  1575. Oliver Ellsworth Homestead
  1576. Oliver Filley House
  1577. Oliver G. Traphagen House
  1578. Oliver H. Bair Funeral Home
  1579. Oliver H. Hovda House
  1580. Oliver Hastings House
  1581. Oliver Hazard Perry Graded School
  1582. Oliver High School
  1583. Oliver Hill Building
  1584. Oliver House (Corning, Arkansas)
  1585. Oliver House (Wakefield, Massachusetts)
  1586. Oliver House, Toledo, Ohio
  1587. Oliver Hutchins House
  1588. Oliver Johnson's Woods Historic District
  1589. Oliver Kelley Farm
  1590. Oliver L. and Catherine Link House
  1591. Oliver Mill Park
  1592. Oliver Miller Homestead
  1593. Oliver O. Stokes House
  1594. Oliver P. Morton House
  1595. Oliver Rice House
  1596. Oliver Street Historic District
  1597. Oliver Sturges House
  1598. Oliver W. Mills House
  1599. Oliver Warner Farmstead
  1600. Oliver Wendell Holmes House
  1601. Oliver White Tavern
  1602. Oliver Whiting Homestead
  1603. Oliver Wight House
  1604. Oliver Wiswall House
  1605. Oliver Wolcott House
  1606. Oliver and Gertrude Lundquist House
  1607. Oliver and Lucy Bonnell Gothic Arch Roofed Barn
  1608. Oliver and Margaret Jeffrey House
  1609. Oliver's Gift (log canoe)
  1610. Oliver-Leming House
  1611. Oliver–Eakle–Barfield Building
  1612. Oliver–Morton Farm
  1613. Olivet Chapel
  1614. Olivet Presbyterian Church
  1615. Olivet United Methodist Church, Parsonage and School
  1616. Olivia Apartments
  1617. Oljato Trading Post
  1618. Ollinger-Cobb House
  1619. Olmstead Place State Park
  1620. Olmstead Street Historic District
  1621. Olmstead station
  1622. Olmsted Family Farmhouse
  1623. Olmsted Station Powerhouse
  1624. Olmsted Subdivision Historic District
  1625. Olmsted-Hixon-Albion Block
  1626. Olney (Joppa, Maryland)
  1627. Olney Carnegie Library
  1628. Olney Cook Artisan Shop
  1629. Olney Elementary School
  1630. Olney Friends School
  1631. Olney High School
  1632. Olney Street–Alumni Avenue Historic District
  1633. Olof Johnson House
  1634. Olompali State Historic Park
  1635. Olsen House (Helena, Montana)
  1636. Olson House (Cushing, Maine)
  1637. Oltjenbruns Farm
  1638. Oluf Larsen House
  1639. Olustee Battlefield Historic State Park
  1640. Olvida Peñas
  1641. Olympia Apartments (Washington, D.C.)
  1642. Olympia Armory
  1643. Olympia Downtown Historic District
  1644. Olympia Fields Country Club
  1645. Olympia Mill
  1646. Olympia School
  1647. Olympia Theater (Miami)
  1648. Olympic Apartment Building
  1649. Olympic Avenue Bridge
  1650. Olympic Cereal Mill
  1651. Olympic Club Hotel
  1652. Olympic National Park Headquarters Historic District
  1653. Olympus Guard Station
  1654. Olzie Whitehead Williams House
  1655. Omaha Bolt, Nut and Screw Building
  1656. Omaha Central High School
  1657. Omaha Ford Motor Company Assembly Plant
  1658. Omaha Hotel
  1659. Omaha National Bank Building
  1660. Omaha Public Library (building)
  1661. Omaha Quartermaster Depot Historic District
  1662. Omaha Rail and Commerce Historic District
  1663. Omaha Star building
  1664. Omaha Union Station
  1665. Omaha station (Chicago, Burlington and Quincy Railroad)
  1666. Omar Chapel
  1667. Omega Chapter of the Chi Phi Fraternity
  1668. Omena Historic District
  1669. Omni Bedford Springs Resort
  1670. Omni Parker House
  1671. Omni William Penn Hotel
  1672. Omohundro Water Treatment Plant
  1673. Omro Village Hall and Engine House
  1674. On the Hill (Boydton, Virginia)
  1675. Onancock Historic District
  1676. Onawa IOOF Opera House
  1677. Onawa Public Library
  1678. Onaway State Park
  1679. Onderdonk House
  1680. One Calvert Plaza
  1681. One Charles Center
  1682. One Main Place (Dallas)
  1683. One Moody Plaza
  1684. One North LaSalle
  1685. One Pendleton Place
  1686. One Thirty North Eighth Building
  1687. One-Million-Liter Test Sphere
  1688. Oneida Armory
  1689. Oneida Community Mansion House
  1690. Oneida Cotton Mills and Scott-Mebane Manufacturing Company Complex
  1691. Oneida County Courthouse (Idaho)
  1692. Oneida County Courthouse (Wisconsin)
  1693. Oneida Lake Congregational Church
  1694. Oneida Milling and Elevator Company Grain Elevator
  1695. Oneida Stake Academy
  1696. Oneida Street Station
  1697. Oneonta Armory
  1698. Oneonta Downtown Historic District
  1699. Oneonta Theatre
  1700. Onesquethaw Valley Historic District
  1701. Ongeluluul
  1702. Onion Creek Bridge (Coffeyville, Kansas)
  1703. Onion Portage Archeological District
  1704. Onon B. and Betsy Dahle House
  1705. Onondaga Highlands–Swaneola Heights Historic District
  1706. Onondaga Park
  1707. Onota, Au Train Township, Michigan
  1708. Onslow Gilmore House
  1709. Ontario Apartments
  1710. Ontario Heritage Square
  1711. Ontario State Bank Block
  1712. Ontario and Livingston Mutual Insurance Office
  1713. Ontario station (Oregon)
  1714. Onteora Park Historic District
  1715. Ontonagon County Courthouse
  1716. Ontonagon Harbor Piers Historic District
  1717. Ontonagon Light
  1718. Ontonagon School
  1719. Onyx Cave (Newburg, Missouri)
  1720. Oolenoy Baptist Church Cemetery
  1721. Ooten House
  1722. Opa-locka Bank
  1723. Opa-locka Company administration building
  1724. Opa-locka station
  1725. Opal's Steak House
  1726. Opana Radar Site
  1727. Opatrny Village Site
  1728. Opelousas Historic District
  1729. Open Air School (Columbus, Ohio)
  1730. Opequon Golf Club
  1731. Opequon Historic District
  1732. Opequon Presbyterian Church
  1733. Opera Block
  1734. Opera Hall Block (King City, Missouri)
  1735. Opera House and Yates Bookshop Building
  1736. Opera House at Boothbay Harbor
  1737. Opera House–Starnes Jewelers Building
  1738. Operation Crossbow Site
  1739. Operation Elster
  1740. Operations and Checkout Building
  1741. Ophir Town Hall
  1742. Opp Cottage
  1743. Oppenheim and St. Johnsville Union Society Church
  1744. Opposition House
  1745. Opus 40
  1746. Oquawka Wagon Bridge
  1747. Oquirrh School
  1748. Oquossoc Log Church
  1749. Ora Adams House
  1750. Ora Blanchard House
  1751. Ora Holland House
  1752. Ora Pelton House
  1753. Oracle State Park
  1754. Oracle Union Church
  1755. Oradell station
  1756. Oraibi, Arizona
  1757. Oram Nincehelser House
  1758. Oran Community Church
  1759. Oran District No. 22 Schoolhouse
  1760. Orange Armory
  1761. Orange Center Historic District (Orange, Connecticut)
  1762. Orange Center Historic District (Orange, Massachusetts)
  1763. Orange City Historic District
  1764. Orange City Town Hall
  1765. Orange Commercial Historic District
  1766. Orange County Courthouse (Indiana)
  1767. Orange County Courthouse (Virginia)
  1768. Orange Cove station (Atchison, Topeka and Santa Fe Railway)
  1769. Orange Grove (Dalzell, South Carolina)
  1770. Orange Grove Court
  1771. Orange Grove Plantation (Saint Helena Island, South Carolina)
  1772. Orange Grove Plantation House (Terrebonne Parish, Louisiana)
  1773. Orange Hall (St. Marys, Georgia)
  1774. Orange High School (Orange, California)
  1775. Orange High School (Orange, Virginia)
  1776. Orange Lawn
  1777. Orange Mill Historic District
  1778. Orange Park Elementary School
  1779. Orange Park Negro Elementary School
  1780. Orange Public Library
  1781. Orange Springs
  1782. Orange Springs Methodist Episcopal Church and Cemetery
  1783. Orange Street Historic District
  1784. Orange Street Presbyterian Church
  1785. Orange Street School
  1786. Orange Vale
  1787. Orange and Alexandria Railroad Bridge Piers
  1788. Orange and Alexandria Railroad Hooff's Run Bridge
  1789. Orange station (NJ Transit)
  1790. Orangeburg City Cemetery
  1791. Orangeburg County Fair Main Exhibit Building
  1792. Orangeburg County Jail
  1793. Orangeburg Downtown Historic District
  1794. Orators Mound
  1795. Orchard Beach State Park
  1796. Orchard House
  1797. Orchard Park station
  1798. Orchard Street United Methodist Church
  1799. Orchestra Hall (Detroit)
  1800. Ordeman-Shaw Historic District
  1801. Oregon Caves Chateau
  1802. Oregon Caves Historic District
  1803. Oregon City Bridge
  1804. Oregon City Carnegie Library
  1805. Oregon City Municipal Elevator
  1806. Oregon Commercial Company Building
  1807. Oregon Commercial Historic District
  1808. Oregon Cracker Company Building
  1809. Oregon Creek Covered Bridge
  1810. Oregon Electric Railway Passenger Station
  1811. Oregon Film Museum
  1812. Oregon Hill
  1813. Oregon Historic District
  1814. Oregon Inlet Station
  1815. Oregon Iron Company Furnace
  1816. Oregon Masonic Hall (Oregon, Wisconsin)
  1817. Oregon Mill Complex
  1818. Oregon Pacific Railroad (1880–1894)
  1819. Oregon Portland Cement Building
  1820. Oregon Public Library
  1821. Oregon Railway and Navigation Company Bridge
  1822. Oregon Route 242
  1823. Oregon Shortline Railroad Company Building
  1824. Oregon State Bank Building
  1825. Oregon State Capitol
  1826. Oregon State Fair
  1827. Oregon State Forester's Office Building
  1828. Oregon State Hospital Historic District
  1829. Oregon State Soldier's Home Hospital
  1830. Oregon State University
  1831. Oregon Supreme Court Building
  1832. Oregon Trail (Ada County, Idaho segment)
  1833. Oregon Trail Historic District (Power County, Idaho)
  1834. Oregon Trail Ruts
  1835. Oregon Trail, Wells Springs Segment
  1836. Oregon Water Tower and Pump House
  1837. Oregon station (Illinois)
  1838. Orem's Delight
  1839. Oren F. and Adelia Parker House
  1840. Orenda/SP-26 Historic District, Chopawamsic RDA Camp 3
  1841. Orendorf Site
  1842. Oretha Castle Haley
  1843. Orford Street Historic District
  1844. Orfordville Depot
  1845. Organ Cave
  1846. Orgonon
  1847. Orie J. Smith Black and White Stock Farm Historic District
  1848. Orient Baptist Church
  1849. Orient Bridge
  1850. Orient Historic District
  1851. Orient Manufacturing Company-Chadwick-Hoskins No. 3
  1852. Orient Point Light
  1853. Oriental Apartments
  1854. Oriental Building Association No. 6 Building
  1855. Oriental Lodge No. 500
  1856. Oriental Mills
  1857. Oriental Textile Mill
  1858. Oriental Theater (Denver)
  1859. Oriental Theatre (Milwaukee)
  1860. Orient–Fosterville Border Crossing
  1861. Original Church of God (Pulaski, Tennessee)
  1862. Original Congregational Church of Wrentham
  1863. Original Highlands, Louisville
  1864. Original Main Street Historic District
  1865. Original Newburgh Historic District
  1866. Original Springs Hotel and Bathhouse
  1867. Original Town of Fernandina Historic Site
  1868. Original Townsite Historic District
  1869. Original Wasco County Courthouse
  1870. Orin Clark House
  1871. Orin Jordan House
  1872. Orin Savage Cottage
  1873. Orion Clemens House
  1874. Oriskany Battlefield State Historic Site
  1875. Orkney Springs Hotel
  1876. Orland P. Bassett House
  1877. Orlando (Andover, Massachusetts)
  1878. Orlando Brice House
  1879. Orlando H. and Emma H. Hardcastle House
  1880. Orlando Health/Amtrak station
  1881. Orlando Humason House
  1882. Orlando Utilities Commission Administration Building
  1883. Orlando W. Warner House
  1884. Orlean Historic District
  1885. Orleans County Courthouse Historic District
  1886. Orleans County Courthouse and Jail Complex
  1887. Orleans Historic District
  1888. Orman-Adams House
  1889. Ormond Fire House
  1890. Ormond Hotel
  1891. Ormond Plantation House
  1892. Ormond Yacht Club
  1893. Ormonde (Cazenovia, New York)
  1894. Ormonde Apartment Building
  1895. Ormsby-Kelly House
  1896. Ormsby-Laughlin Textile Companies Mill
  1897. Ormsby–Rosser House
  1898. Orna Villa
  1899. Orndoff-Cross House
  1900. Orne Covered Bridge
  1901. Orofino Historic District
  1902. Orono Main Street Historic District
  1903. Orono Post Office
  1904. Orosi Branch Library
  1905. Orote Field
  1906. Orote Historical Complex
  1907. Oroville Carnegie Library
  1908. Oroville Chinese Temple
  1909. Orpheum Lofts
  1910. Orpheum Theater (New Orleans)
  1911. Orpheum Theater (Sioux Falls)
  1912. Orpheum Theater (St. Louis)
  1913. Orpheum Theatre (Champaign, Illinois)
  1914. Orpheum Theatre (Madison, Wisconsin)
  1915. Orpheum Theatre (Memphis)
  1916. Orpheum Theatre (Minneapolis)
  1917. Orpheum Theatre (Omaha)
  1918. Orpheum Theatre (Phoenix, Arizona)
  1919. Orpheum Theatre (Sioux City, Iowa)
  1920. Orpheum Theatre (Wichita, Kansas)
  1921. Orr Iron Company
  1922. Orr Roadside Parking Area
  1923. Orr School
  1924. Orr-Herl Mound and Village Site
  1925. Orrin B. Hartley House
  1926. Orrin Hoadley House
  1927. Orrin Todd House
  1928. Orrin W. Burritt House
  1929. Orrin White House
  1930. Orrin and Roxanne Fairman Kinyon House
  1931. Orsel and Minnie McGhee House
  1932. Orson Ames House
  1933. Orson Everitt House
  1934. Orson Grimmett Bungalow
  1935. Orson Pratt House
  1936. Orson Rogers House
  1937. Ortega (Jacksonville)
  1938. Orth C. Galloway House
  1939. Orth House
  1940. Orthodox Meetinghouse
  1941. Ortiz House (Yuma, Arizona)
  1942. Orton Memorial Laboratory
  1943. Orton Park
  1944. Orton Park Historic District
  1945. Orton Plantation
  1946. Ortonville Mill
  1947. Orvall Gammill Barn
  1948. Orville Beach Memorial Manual Training School
  1949. Orville Jackson House
  1950. Orville P. and Sarah Chubb House
  1951. Orville T. Waring House
  1952. Orvis Road Historic District
  1953. Orwell Site (Orwell, Vermont)
  1954. Orwell site (Fergus Falls, Minnesota)
  1955. Osage Bank of Fairfax
  1956. Osage City station
  1957. Osage Commercial Historic District
  1958. Osage County Courthouse (Kansas)
  1959. Osage County Poorhouse
  1960. Osage Farms Resettlement Properties in Pettis County, Missouri
  1961. Osage Mills Dam
  1962. Osage Mission Infirmary
  1963. Osage Village State Historic Site
  1964. Osborn Hotel
  1965. Osborn House
  1966. Osborn Street School
  1967. Osborne Homestead Museum
  1968. Osborne House (Victor, New York)
  1969. Osborne Public Carnegie Library
  1970. Osborne Wells House
  1971. Osborn–Bennett Historic District
  1972. Osborn–Bouton–Mead House
  1973. Oscar Anderson House Museum
  1974. Oscar Blomeen House
  1975. Oscar C. Diehl House
  1976. Oscar C. Woods House
  1977. Oscar Carlson House
  1978. Oscar Chambers House
  1979. Oscar Crow House
  1980. Oscar Easley Block
  1981. Oscar F. Lyons House
  1982. Oscar Foss Memorial Library
  1983. Oscar G. Johnson VA Medical Center
  1984. Oscar G. and Mary H. Burch House
  1985. Oscar Gill House
  1986. Oscar Hammerstein II Farm
  1987. Oscar Leibhart Site
  1988. Oscar Lindsay House
  1989. Oscar M. Booth House
  1990. Oscar Nichols House
  1991. Oscar Redman Building
  1992. Oscar Roeser House
  1993. Oscar Stanton De Priest House
  1994. Oscar Taylor House
  1995. Oscar W. Underwood House
  1996. Oscar and Christina Beckman Farmstead
  1997. Oscar-Zero Missile Alert Facility
  1998. Osceola Apartment Hotel
  1999. Osceola Commercial Historic District
  2000. Osceola County Courthouse (Florida)
  2001. Osceola County Courthouse (Iowa)
  2002. Osceola Ditch
  2003. Osceola Park Historic Residential District
  2004. Osceola Public School Building
  2005. Osceola Times Building
  2006. Osceola Town Hall
  2007. Osceola station
  2008. Osceola station (Wisconsin)
  2009. Osgood Bradley Building
  2010. Osgood Building
  2011. Osgood Ditch
  2012. Osgood Family House
  2013. Osgood Farm
  2014. Osgood Gamekeeper's Lodge
  2015. Osgood Hill
  2016. Osgood–Kuhnhausen House
  2017. Oshkosh Grand Opera House
  2018. Oshkosh Northwestern
  2019. Oshkosh Water Tower
  2020. Oshtemo Town Hall
  2021. Oskaloosa City Hall
  2022. Oskaloosa City Park and Band Stand
  2023. Oskaloosa City Square Commercial Historic District
  2024. Oskaloosa Fire Station
  2025. Oskaloosa Monthly Meeting of Friends Parsonage
  2026. Oskaloosa Post Office
  2027. Oskaloosa Public Library
  2028. Oskaloosa station
  2029. Oskar G. Stonorov House
  2030. Osmund Osmundson House
  2031. Osmyn and Emily Deuel House
  2032. Osprey School
  2033. Osprey Site
  2034. Ossabaw Island
  2035. Osseo Water Tower
  2036. Ossian H. Sweet House
  2037. Ossian Opera House
  2038. Ossian Wilbur Goss Reading Room
  2039. Ossoli Circle
  2040. Ost Valle Bridge
  2041. Osterburg Covered Bridge
  2042. Osterhoudt Stone House
  2043. Osterman and Tremaine Building
  2044. Osterville Baptist Church
  2045. Oswald J. Nitschke House
  2046. Oswegatchie Historic District
  2047. Oswegatchie Pumping Station
  2048. Oswego Armory
  2049. Oswego City Hall
  2050. Oswego City Library
  2051. Oswego County Courthouse
  2052. Oswego Harbor West Pierhead Light
  2053. Oswego Meeting House and Friends' Cemetery
  2054. Oswego Public Library
  2055. Oswego Theater
  2056. Oswego United States Post Office
  2057. Oswego Yacht Club
  2058. Oswego–Oneida Streets Historic District
  2059. Oteen Veterans Administration Hospital Historic District
  2060. Otero's 66 Service
  2061. Otha Walker Homestead
  2062. Other C. Wamsley House
  2063. Othniel Looker House
  2064. Otho Poole House
  2065. Otis Angell Gristmill
  2066. Otis Cary House
  2067. Otis Center Historic District
  2068. Otis Company Mill No. 1
  2069. Otis Elevator Company Building (Portland, Oregon)
  2070. Otis Elevator Company Factory Building
  2071. Otis Hare Archeological Site
  2072. Otis Hotel
  2073. Otis L. Brown House
  2074. Otis Park and Golf Course
  2075. Otis Putnam House
  2076. Otis Starkey House
  2077. Otis Theodore and Effiegene Locke Wingo House
  2078. Otis-Wyman House
  2079. Otoe County Courthouse
  2080. Otowi Historic District
  2081. Otowi Suspension Bridge
  2082. Otranto Plantation
  2083. Otranto Plantation Indigo Vats
  2084. Otsdawa Baptist Church
  2085. Otsego Apartments
  2086. Otsego County Courthouse
  2087. Ott's Assay Office
  2088. Ott's Chapel
  2089. Ottari Sanitarium
  2090. Ottauquechee River Bridge
  2091. Ottawa (tug)
  2092. Ottawa Beach Historic District
  2093. Ottawa Commercial Historic District
  2094. Ottawa East Side Historic District
  2095. Ottawa High School and Junior High School
  2096. Ottawa Library (Kansas)
  2097. Ottawa Street Power Station
  2098. Ottawa Waterworks Building
  2099. Ottendorfer Public Library and Stuyvesant Polyclinic Hospital
  2100. Otter Creek Archaeological Site (Ferrum, Virginia)
  2101. Otter Creek Bridge (Cedar Vale, Kansas)
  2102. Otter Creek Bridge (Oelwein, Iowa)
  2103. Otter Lake Community Church
  2104. Otter Spring House
  2105. Otter Tail County Courthouse
  2106. Otterbein Church (Baltimore, Maryland)
  2107. Otterbein Church (Evans, West Virginia)
  2108. Otterburn (Bedford, Virginia)
  2109. Otto Brinkmann House
  2110. Otto Carmichael House
  2111. Otto H. Baring House
  2112. Otto Huechling House
  2113. Otto J. Hager House
  2114. Otto Schlemmer Building
  2115. Otto Sr. and Lisette Hahn House
  2116. Otto W. and Ida L. Nelson House
  2117. Otto and Hilda Gretzinger House
  2118. Otto and Verdell Rutherford House
  2119. Ottumwa Cemetery
  2120. Ottumwa City Hall
  2121. Ottumwa Public Library
  2122. Ottumwa Regional Airport
  2123. Ottumwa Young Women's Christian Association
  2124. Ottumwa station
  2125. Otway Covered Bridge
  2126. Otway Henderson House
  2127. Otwell (Oxford, Maryland)
  2128. Ouachita Avenue Historic District
  2129. Ouachita County Courthouse
  2130. Ouachita Parish High School
  2131. Ouachita River Bridge (Arkadelphia, Arkansas)
  2132. Ouachita River Lock and Dam No. 8
  2133. Ouaquaga Lenticular Truss Bridge
  2134. Ouilmette North Historic District
  2135. Oulagisket
  2136. Our Lady Help of Christians Chapel (Cheektowaga, New York)
  2137. Our Lady Help of Christians Historic District (Newton, Massachusetts)
  2138. Our Lady of Good Voyage Church (Gloucester, Massachusetts)
  2139. Our Lady of Grace Church (Reserve, Louisiana)
  2140. Our Lady of Guadalupe Church (San Jose, California)
  2141. Our Lady of Guadalupe Church and Medina Cemetery
  2142. Our Lady of Limerick Catholic Church (Glenns Ferry, Idaho)
  2143. Our Lady of Loretto Roman Catholic Church and Cemetery
  2144. Our Lady of Lourdes Church (Victoria, Texas)
  2145. Our Lady of Lourdes Church Complex
  2146. Our Lady of Mercy Chapel
  2147. Our Lady of Mercy High School (Ohio)
  2148. Our Lady of Mount Carmel Grotto
  2149. Our Lady of Mt. Carmel Church
  2150. Our Lady of Perpetual Help Church (Altus, Arkansas)
  2151. Our Lady of Perpetual Help Roman Catholic Church
  2152. Our Lady of Purification Catholic Church
  2153. Our Lady of Sorrows Catholic Church (Rock Springs, Wyoming)
  2154. Our Lady of Sorrows Chapel
  2155. Our Lady of Sorrows Church (Bernalillo, New Mexico)
  2156. Our Lady of Sorrows Church (Las Vegas, New Mexico)
  2157. Our Lady of Victory Academy (Fort Worth, Texas)
  2158. Our Lady of Victory Basilica (Lackawanna, New York)
  2159. Our Lady of Victory Catholic Church (Pearce, Arizona)
  2160. Our Lady of Victory Roman Catholic Church
  2161. Our Lady of the Angels Academy
  2162. Our Lady of the Angels School (Albuquerque, New Mexico)
  2163. Our Lady of the Annunciation Chapel at Annunciation Priory
  2164. Our Lady of the Assumption School
  2165. Our Lady of the Blessed Sacrament Church
  2166. Our Lady of the Ozarks Shrine
  2167. Our Lady of the Rosary Church (Detroit)
  2168. Our Lady of the Wayside Church
  2169. Our Lady, Queen of Heaven Church
  2170. Our Mother of Mercy Catholic Church and Parsonage
  2171. Our Mother of Sorrows Grotto Historic District
  2172. Our Mother of Sorrows Monastery and Retreat Center (West Springfield, Massachusetts)
  2173. Our Mother of Sorrows Roman Catholic Church Complex
  2174. Our Savior's Kvindherred Lutheran Church (Calamus, Iowa)
  2175. Our Savior's Lutheran Church (Menno, South Dakota)
  2176. Our Savior's Scandinavian Lutheran Church
  2177. Our Saviour's Evangelical Lutheran Church
  2178. Ourant's School
  2179. Ouray City Hall and Walsh Library
  2180. Ouray Historic District
  2181. Out-of-Door Academy
  2182. Outdoor Art Club
  2183. Outing Club
  2184. Outing Park Historic District
  2185. Outlands in the Eighty Acres
  2186. Outlaw Inn
  2187. Outlet Mound
  2188. Outlook station (Montana)
  2189. Over-the-Jumps Carousel
  2190. Over-the-Rhine
  2191. Overackers Corners Schoolhouse
  2192. Overbrook (Nashville, Tennessee)
  2193. Overbrook Elementary School
  2194. Overbrook Farms, Philadelphia
  2195. Overbrook High School (Philadelphia)
  2196. Overcarsh House
  2197. Overfield Tavern
  2198. Overholser Mansion
  2199. Overland Waterloo Company Building
  2200. Overlook (Little Falls, New York)
  2201. Overlook (Martinsburg, West Virginia)
  2202. Overlook Castle
  2203. Overlook Historic District
  2204. Overmyer–Waggoner–Roush Farm
  2205. Overseas Highway
  2206. Overstreet Hall
  2207. Overstreet House
  2208. Overton Corners–Lacolle 221 Border Crossing
  2209. Overton Farm
  2210. Overton Gymnasium
  2211. Overton Lane
  2212. Overton Park
  2213. Overtown Historic District
  2214. Oviatt House
  2215. Owasco Reformed Church
  2216. Owatonna Commercial Historic District
  2217. Owatonna Firemen's Hall
  2218. Owatonna Public Library
  2219. Owego Central Historic District
  2220. Owen A. and Emma J. Garretson House
  2221. Owen B. Pickett United States Custom House
  2222. Owen Building (Columbia, South Carolina)
  2223. Owen Chapel Church of Christ
  2224. Owen Coachman House
  2225. Owen County Courthouse (Indiana)
  2226. Owen County Courthouse and Jail
  2227. Owen E. LeFevre House
  2228. Owen Estate
  2229. Owen Family House and Cemetery
  2230. Owen High School
  2231. Owen Lovejoy House
  2232. Owen Martin House
  2233. Owen Moon Farm
  2234. Owen Park, Tulsa
  2235. Owen Plantation House
  2236. Owen Tudor Hedges House
  2237. Owen-Cox House
  2238. Owen-Gay Farm
  2239. Owen-Harrison House
  2240. Owen-Primm House
  2241. Owensville Historic District
  2242. Owens–Thomas House
  2243. Owings House
  2244. Owings Upper Mill
  2245. Owingsville Commercial District and Courthouse Square
  2246. Owl Blacksmith Shop
  2247. Owl's Bend Site
  2248. Owl's Head Historic District
  2249. Owl's Nest
  2250. Owl's Nest Country Place
  2251. Owls Head (Hebron, New Hampshire)
  2252. Owls Head Light
  2253. Owosso Downtown Historic District
  2254. Owsley Bridge
  2255. Owyhee County Courthouse
  2256. Owyhee Dam
  2257. Ox Bow Inn
  2258. Oxbow Archeological District
  2259. Oxbow Historic District
  2260. Oxford Commercial Historic District
  2261. Oxford Congregational Church and Cemetery
  2262. Oxford Courthouse Square Historic District
  2263. Oxford Downtown Historic District
  2264. Oxford Female Institute
  2265. Oxford Furnace
  2266. Oxford Historic District (Georgetown, Kentucky)
  2267. Oxford Historic District (Oxford, Georgia)
  2268. Oxford Historic District (Oxford, Maryland)
  2269. Oxford Historic District (Oxford, North Carolina)
  2270. Oxford Historic District (Oxford, Pennsylvania)
  2271. Oxford Hotel (Denver, Colorado)
  2272. Oxford Hotel (Oxford, Pennsylvania)
  2273. Oxford Hotel (West Baden Springs, Indiana)
  2274. Oxford House (Grand Forks, North Dakota)
  2275. Oxford Industrial Historic District
  2276. Oxford Main Street Historic District
  2277. Oxford Presbyterian Church
  2278. Oxford School (Fairhaven, Massachusetts)
  2279. Oxford Village Historic District
  2280. Oxford station (Baltimore and Ohio Railroad)
  2281. Oxford-Whitney Streets Historic District
  2282. Oxford–Crown Historic District
  2283. Oxley Barn
  2284. Oxmoor Farm
  2285. Oxnard Historic Farm Park
  2286. Oxon Cove Park and Oxon Hill Farm
  2287. Oxon Hill Manor
  2288. Oyster Bay station
  2289. Ozark Courthouse Square Historic District (Ozark, Arkansas)
  2290. Ozark Courthouse Square Historic District (Ozark, Missouri)
  2291. Ozark Iron Furnace Stack
  2292. Ozark Trails Marker at Lake Arthur
  2293. Ozark station (Arkansas)
  2294. Ozette Indian Village Archeological Site
  2295. Ozias Goodwin House
  2296. Ozmer House
  2297. Ozone School
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