| Code | Name | Region |
|---|---|---|
| USA3F | Ashford | CT |
| US9AS | Ashford | WV |
| USW24 | Ashippun | WI |
| USASM | Ashkum | IL |
| USALY | Ashland | AL |
| US3AL | Ashland | CA |
| US7AI | Ashland | IL |
| USIZH | Ashland | KS |
| USANL | Ashland | KY |
| USASD | Ashland | MA |
| USA47 | Ashland | ME |
| US8MA | Ashland | MI |
| USAHJ | Ashland | MO |
| USAXM | Ashland | MS |
| USNEX | Ashland | NE |
| USAHL | Ashland | NH |
| USASK | Ashland | OH |
| USASI | Ashland | OR |
| USYB9 | Asbury | MO |
| USAJU | Asbury | NJ |
| USARX | Asbury Park | NJ |
| USASB | Asbury, Gloucester | NJ |
| USASU | Asbury, Warren | NJ |
| USEY9 | Ascutney | VT |
| USAS8 | Ash | NC |
| USAZF | Ash Flat | AR |
| USAF8 | Ash Fork | AZ |
| USZAV | Ash Grove | MO |
| USAHW | Ashaway | RI |
| USABN | Ashburn | GA |
| USQAS | Ashburn | VA |
| USHHA | Ashburnham | MA |
| US4BY | Ashby | MA |
| USHBY | Ashby | MN |
| USADN | Ashdown | AR |
| USASR | Asheboro | NC |
| USXA2 | Asherville | KS |
| USAEV | Asheville | NC |
| USNGO | Arrington | TN |
| USYZA | Arrington | VA |
| USAG2 | Arroyo Grande | CA |
| USAR6 | Arroyo Seco | NM |
| USATM | Artesia | CA |
| USAJI | Artesia | MS |
| USATS | Artesia | NM |
| USA2R | Artesia | TX |
| USTIZ | Artesian | SD |
| USA6T | Arthur | IA |
| USAXH | Arthur | IL |
| USAC7 | Arthur City | TX |