| Code | Name | Region |
|---|---|---|
| USAOU | Avalon | CA |
| USAVS | Avalon | GA |
| US9AV | Avalon | NJ |
| USAVB | Avalon | TX |
| USXBK | Avard | OK |
| USAL9 | Avenal | CA |
| USAVE | Avenel | NJ |
| USAVW | Avenel/washington, D.c. | MD |
| USAVU | Aventura | FL |
| USAV9 | Averill Park | NY |
| USA3V | Avery | CA |
| USAVT | Avery | TX |
| USAYB | Avery Hill | IL |
| USAVI | Avery Island | LA |
| USALQ | Avilla | IN |
| USAWJ | Avinger | TX |
| USVOC | Avoca | IA |
| USA9A | Avoca | NE |
| USAUF | Aurora | OH |
| USAUX | Aurora | OR |
| USUOR | Aurora | SD |
| USUOA | Aurora | UT |
| US4UR | Aurora | WV |
| USAUL | Austell | GA |
| USNA8 | Austin | AR |
| USAKU | Austin | AR |
| USZAW | Austin | CO |
| USXBJ | Austin | IN |
| USAUM | Austin | MN |
| USASQ | Austin | NV |
| USAUS | Austin | TX |
| USASG | Austinburg | OH |
| USAUV | Austintown | OH |
| USJLV | Austinville | VA |
| USAGV | Autaugaville | AL |
| USKYX | Auxier | KY |
| USV8X | Auxvasse | MO |
| USA2V | Ava | IL |
| USAJG | Augusta | MT |
| USAU2 | Augusta | NJ |
| USUDZ | Augusta | OH |
| USUUA | Augusta | WI |
| USVAU | Augusta Springs | VA |
| USU9A | Aukum | CA |
| USAUY | Aulander | NC |
| USAL4 | Ault | CO |
| USUTM | Aultman | PA |
| USUSV | Aumsville | OR |
| USKAR | Aura | NJ |
| USAUC | Aurora | CO |