| Ayr, NE (Village) |
| Ayr, NE (Township) |
| Ayr, PA (Township) |
| Ayrshire, IA (City) |
| Azle, TX (City) |
| Aztalan, WI (Town) |
| Aztec, NM (City) |
| Azusa, CA (City) |
| Babbie, AL (City) |
| Babbitt, MN (City) |
| Babylon, NY (Village) |
| Babylon, NY (Town) |
| Baca County, CO (County) |
| Bachelor, KS (Township) |
| Backus, MN (City) |
