All - Architectural style - Federal architecture
| 1790 House |
| 2000 Block Of Eye Street, NW |
| Abbot-Battles House |
| Abbot House |
| Abbott-Page House |
| Abell House |
| Abrams Plains |
| Abyssinian Meeting House |
| Academy Building |
| Academy Hall |
| Academy, The |
| Acquinsicke |
| Acton House |
| Acworth Congregational Church |
| Adams, Benjamin, House |
| Adams, Demas, House |
| Adams-Magoun House |
| Adams-Ryan House |
| Adams Street Double House |
| Addams, John H., Homestead |
| Adelphi School |
| Adsit Cobblestone Farmhouse |
| African Meetinghouse |
| Agler-La Follette House |
| Ahearn House and Summer House |
| Aiken, Gov. William, House |
| Aiken House |
| Aillet House |
| Airlie |
| Airville |
| Airy Hill |
| Alden, Ebenezer, House |
| Aldrich, Aaron, House |
| Aldrich, J., House |
| Aldrich, Nelson W., House |
| Aldrich, S., House |
| Alexander, James, House |
| Alexander Plantation House |
| Alexander, Simeon, Jr. House |
| Alexander, William T., House |
| Allen-Alexander House |
| Allen, Candace, House |
| Allendale Farm |
| Allen, Dr. Peter, House |
| Allen, James House |
| Allen, John C., House |
| Allen, John, House |
| Allen, Nathan, House |
| Allen's, James, Inn |
| Allen, Zachariah, House |
| Allison, William, House |
| Ames Academy Building |
| Ames, Leonard, Farmhouse |
| Anderson House |
| Anderson, Judge William Shaw, House |
| Anderson, Niels Ole, House |
| Anderson-Shaffer House |
| Andrews, Lt. Robert, House |
| Andrews-Moore House |
| Andrews Tavern |
| Angell-Ballou House |
| Annas Farmhouse |
| Annefield |
| Anthony, David Rinehart, House |
| Anthony House |
| Apple, Christopher, House |
| Appomattox Iron Works |
| Araby |
| Archambault House |
| Archibald-Adams House |
| Arch Street Friends Meeting House |
| Arlington |
| Armstrong-Walker House |
| Arndt, Jacob, House and Barn |
| Arnheim |
| Arnold, Dexter, Farmstead |
| Arnold, John, House |
| Arrow Rock Tavern |
| Arsenal House |
| Arts Club of Washington |
| Ashbourne |
| Ashland |
| Ashley House |
| Askren, Thomas, House |
| Atherton Farmstead |
| Athol |
| A. T. House |
| Atwater, George, House |
| Auburn |
| Auld-McCobb House |
| Austerlitz |
| Avenel |
| Averitt-Herod House |
| Ayres, John, House |
| Bacon-Merchant-Moss House |
| Baker, Benjamin, Jr., House |
| Baker, Capt. Seth, Jr., House |
| Baker, James, House |
| Baker, John, Tavern |
| Baker, Newton D., House |
Data from United States Park Service and Wikidata
