| Code | Name | Region |
|---|---|---|
| USAWN | Allentown | PA |
| USAT2 | Allentown, Allegany | NY |
| USAWO | Allenwood | NJ |
| USAZW | Allenwood | PA |
| USALT | Allerton | IA |
| US9AT | Alleyton | TX |
| USAL3 | Alliance | LA |
| USAIA | Alliance | NE |
| USYAG | Algood | TN |
| USALH | Alhambra | CA |
| USALI | Alice | TX |
| USAIV | Aliceville | AL |
| USACA | Alicia | MI |
| US3AF | Alief | TX |
| USAQP | Aliquippa | PA |
| USAVJ | Aliso Viejo | CA |
| USALZ | Alitak | AK |
| USAET | Allakaket | AK |
| USUOY | Allamuchy | NJ |
| USA3A | Alledonia | OH |
| USALL | Allegan | MI |
| USNYZ | Allegany | NY |
| USUBP | Allegheny | PA |
| USAG3 | Allegheny County Apt/pittsburgh | PA |
| USAQ9 | Allen | KY |
| USAN2 | Allen | MI |
| USA3N | Allen | OK |
| USXAL | Allen | TX |
| USAXA | Alexandria | PA |
| USXAA | Alexandria | TN |
| USAXR | Alexandria | VA |
| USAXB | Alexandria Bay | NY |
| USLEV | Alexis | IL |
| US5G3 | Alexis | NC |
| USA74 | Alford | MA |
| USAFE | Alfred | ME |
| USQAF | Alfred | NY |
| USAFS | Alfred Station | NY |
| USAQG | Alger | MI |
| USAJE | Alger | OH |
| USUAY | Algiers | LA |
| USQGD | Algodones | NM |
| USAMZ | Algoma | MS |
| USQAG | Algoma | WI |
| USAXG | Algona | IA |
| USUBJ | Algona | WA |
| USALG | Algonac | MI |
| USAGQ | Algonquin | IL |
| USYLF | Alden | NY |
| USA75 | Alder | MT |