All - Constructed - 1910–1919
| Apremont Triangle Historic District |
| Arab Mountain Fire Observation Station |
| Aragon House |
| Arambarri, Galo, Boarding House |
| Arcade Building |
| Arcade, The |
| Archmere |
| Arctic Building |
| Ardmore Avenue Train Station |
| Argentine Carnegie Library |
| Arkansas City High School |
| Arkansas Valley Lodge No. 21, Prince Hall Masons |
| Arleta Branch Library |
| Arlington |
| Arlington Gaslight Company |
| Arlington Hills Library |
| Armstrong, Louis, House |
| Army Corps of Engineers Road System |
| Arnold-Park Log Home |
| Arrawanna Bridge |
| Asbury, Francis, Memorial |
| Ashcroft, Thomas, Ranch |
| Ashland County Courthouse |
| Ashland Harbor Breakwater Light |
| Ashland Oregon National Guard Armory |
| Ashland Public Library |
| Asilomar Conference Grounds |
| Atchison, Topeka and Santa Fe Railway Depot |
| Atkin, James, House |
| Atkinson-Williams Warehouse |
| Atlantic Coast Line Railroad Station |
| AT & SF Roundhouse |
| ATSF Steam Locomotive No. 3415 |
| Attucks Theatre |
| Auditorium, The |
| Audubon Park Historic District |
| Auld Public Library |
| Aurora Public Library |
| Austin-McDonald House |
| Auto Coach Building |
| Auto Rest Garage |
| Autry, James L., House |
| Avery County Jail |
| Aviator, The |
| Ax Billy Department Store |
| Ayer Public Library |
| Ayers House |
| Ayling, John G., House |
| Aztec Ruins Administration Building-Museum |
| Babcock, Dr. Raymond, House |
| Baca, A. B., House |
| Bach, Emil, House |
| Backbone State Park Historic District |
| Bacon County Courthouse |
| Bacon Family Homestead |
| Badger Building |
| Badger State Shoe Company |
| Bagby Guard Station |
| Bailey Hall |
| Bailey, Louis J., Branch Library-Gary International Institute |
| Baker, Cassius and Adelia, House |
| Baldpate Inn |
| Baldwin Building |
| Baldwin House |
| Ball, Abraham and Phoebe, House |
| Ballard-Sego Coal Mine Historic District |
| Bally Blacksmith Shop |
| Balmoral Court |
| Baltimore Gas and Electric Company Building |
| Bancroft Hotel |
| Bandelier National Monument Archeological and Historic District (Boundary Increase) |
| Bangall Post Office |
| Bank of Alamo |
| Bank of American Fork |
| Bank of Andalusia |
| Bank of Columbia |
| Bank of Ensley |
| Bank of Italy |
| Bank of Italy |
| Bank of Jakin |
| Bank of Onslow and Jacksonville Masonic Temple |
| Bank of Surrency |
| Bank of Vernal |
| Baptist Church of Christ at Sardis |
| Bar B C Dude Ranch |
| Barbee, George and Neva, House |
| Barber, O. C., Piggery |
| Barder, Byron R., House |
| Barnard Block |
| Barnes, Frank C., House |
| Barnesville Depot |
| Barnhart-Wright House |
| Barnsdall Main Street Well Site |
| Barnum Hotel |
| Barrett, Martin, House |
| Bartlett Arboretum |
| Barton-Lackey Cabin |
| Basilica of St. Mary-Catholic |
| Baskerville Apartment Building |
| Baugh, W. H., House |
Data from United States Park Service and Wikidata
