| Atlantic Beach, SC (Town) |
| Atlantic Beach , FL (City) |
| Atlantic City, NJ (City) |
| Atlantic County, NJ (County) |
| Atlantic Highlands, NJ (Borough) |
| Atlantis , FL (City) |
| Atlas Township, MI (Township) |
| Atlas Township, IL (Township) |
| Atmore, AL (City) |
| Atoka, OK (City) |
| Atoka, TN (Town) |
| Atoka County, OK (County) |
| Atomic City, ID (City) |
| Atqasuk, AK (City) |
| Attala County, MS (County) |
