| Appleton City, MO (City) |
| Applewold, PA (Borough) |
| Appling County, GA (County) |
| Appomattox, VA (Town) |
| Appomattox County, VA (County) |
| Aqua One Community Development District, FL (CDD) |
| Aquilla, TX (City) |
| Aquilla, OH (Village) |
| Aquinnah, MA (Town) |
| Arab, AL (City) |
| Arabi, GA (Town) |
| Arago, MN (Township) |
| Aragon, GA (City) |
| Aransas County, TX (County) |
| Aransas Pass, TX (City) |
