| Code | Name | Region |
|---|---|---|
| USBAI | Bailey | MI |
| USBA4 | Bailey | NC |
| USEYI | Bailey Island | ME |
| USYBQ | Baileyton | AL |
| USILY | Baileyville | ME |
| USBGE | Bainbridge | GA |
| USBCA | Bainbridge | NY |
| USB8G | Bainbridge | OH |
| USAFB | Avondale | PA |
| USAVM | Avonmore | PA |
| USAWW | Awendaw | SC |
| USAXS | Axis | AL |
| USAX3 | Axson | GA |
| USAX4 | Axtell | NE |
| USVXT | Axtell | UT |
| USAXO | Axton | VA |
| USYEN | Ayden | NC |
| USAER | Ayer | MA |
| USAYR | Ayersville | GA |
| USAYT | Aylett | VA |
| USAY2 | Aynor | SC |
| USZKK | Azalea Park | FL |
| USAZL | Azle | TX |
| USZZT | Aztec | NM |
| USAZU | Azusa | CA |
| US2BB | Babbitt | MN |
| USBAK | Babcock | WI |
| USBBY | Babylon | NY |
| US2AV | Avoca | NY |
| USAOC | Avoca | PA |
| USAA3 | Avoca | WI |
| USANW | Avon | CO |
| USAVZ | Avon | CT |
| USVON | Avon | IL |
| USVAO | Avon | IN |
| USAVY | Avon | KY |
| USAVN | Avon | MA |
| USAVF | Avon | MN |
| USZVO | Avon | NC |
| USAVV | Avon | NY |
| USAVQ | Avon | OH |
| USAVC | Avon Lake | ME |
| USAVK | Avon Lake | OH |
| USAVO | Avon Park | FL |
| USAVH | Avon-by-the-sea | NJ |
| USAVG | Avondale | AZ |
| USAJW | Avondale | CO |
| USAVD | Avondale | LA |
| USAQB | Ava | MO |
| USQAV | Ava | NY |