| Code | Name | Region |
|---|---|---|
| USQEA | Ames | TX |
| USAMX | Amesbury | MA |
| USYAM | Amherst | MA |
| US7AH | Amherst | ME |
| USUBI | Amherst | NH |
| USAMH | Amherst | NY |
| USZAH | Amherst | OH |
| USZAM | Amherst | SD |
| USXSF | Amherst | TX |
| USAHR | Amherst | VA |
| USXWI | Amherst | WI |
| USA78 | Amissville | VA |
| USUBH | Amite | LA |
| USIY3 | Amity | AR |
| USAMJ | Amity | OR |
| USAYZ | Amityville | NY |
| USAM9 | Amlin | OH |
| USAM5 | Ammon | ID |
| USAMR | Ambler | PA |
| USOPP | Amboy | CA |
| USAMY | Amboy | IL |
| USA72 | Amboy | WA |
| USUBF | Ambridge | PA |
| USSBR | Ambrose | GA |
| USAMB | Ambrose | ND |
| USQHH | Ambrose Channel Light | NJ |
| USAHT | Amchitka | AK |
| USAEI | Amelia | LA |
| USOHM | Amelia | OH |
| USXXS | Amelia | TX |
| USAML | Amelia | VA |
| USALC | Amelia City | FL |
| USAD6 | Amelia Island | FL |
| USACY | American Canyon | CA |
| USYAF | American Falls | ID |
| USZAF | American Fork | UT |
| USAMU | Americus | GA |
| USAHH | Amery | WI |
| USAR2 | Alvarado | MN |
| USZAD | Alvarado | TX |
| USA2T | Alvaton | GA |
| USAZC | Alvin | TX |
| USAZD | Alviso | CA |
| US6AV | Alvord | IA |
| USAV5 | Alvordton | OH |
| USAQY | Alyeska | AK |
| USA5S | Alys Beach | FL |
| USAMD | Ama | LA |
| USAZ6 | Amado | AZ |
| USAA6 | Amador | IA |