| Acton, ND (Township) |
| Acushnet, MA (Town) |
| Acworth, GA (City) |
| Acworth, NH (Town) |
| Ada, MN (City) |
| Ada, SD (Township) |
| Ada, ND (Township) |
| Ada, OK (City) |
| Ada, OH (Village) |
| Ada County, ID (County) |
| Ada Township, MI (Township) |
| Adair, IA (City) |
| Adair, OK (Town) |
| Adair County, KY (County) |
| Adair County, IA (County) |
