| Abbey of the Genesee | 36 |
| Adair, Crawford, House | 32 |
| Adams - Demyda House | 193 |
| Adams - Grabowski House | 194 |
| Adler, Edward, House | 151 |
| Adler, John, House | 150 |
| Adzit - Reber House | 56 |
| Aker - Leimann House | 65 |
| Albany County | 16 |
| Albion, West County Rd. School | 116 |
| Alderman Rd. Schoolhouse | 94 |
| Allen, Davis, House | 165 |
| Allen House | 44 |
| Allen House | 197 |
| Allen - Van Buskert House | 19 |
| Alton Methodist Church | 182 |
| Ames, Howard, House | 221 |
| Amos - Flynn House | 138 |
| Anderson - Prestley House | 122 |
| Andrews, Bernard, House | 123 |
| Andrews - Goheen House | 138 |
| Angus - Jensen House | 205 |
| Applegate House | 134 |
| Armstrong, Donald, House | 146 |
| Arnold - Ball House | 182 |
| Arnold, Willis, House | 44 |
| Atkinson House | 100 |
| Aurora, Ohio, House | 216 |
| Avery - Musshafen House | 175 |
| Avery - Van Orman House | 21 |