| Code | Name | Region |
|---|---|---|
| USALV | Albertville | MN |
| USAL6 | Albia | IA |
| USAQI | Albin | WY |
| USAB7 | Albion | IA |
| USAN5 | Albion | ID |
| USAOB | Albion | IL |
| USYAB | Albion | IN |
| USAO7 | Albion | ME |
| USNGZ | Alameda | CA |
| USUBB | Alamo | CA |
| USAM8 | Alamo | NV |
| USAMT | Alamo | TN |
| USAMO | Alamo | TX |
| USALM | Alamogordo | NM |
| USALS | Alamosa | CO |
| USYAN | Alanson | MI |
| USTLB | Alba | MI |
| USXAB | Alba | TX |
| USALA | Albany | CA |
| USABY | Albany | GA |
| USAJB | Albany | IL |
| USAB5 | Albany | IN |
| USAY9 | Albany | KY |
| USA7Y | Albany | LA |
| USAL2 | Albany | MN |
| US5BN | Albany | MO |
| USALB | Albany | NY |
| USUBA | Albany | OH |
| USAKQ | Akers | LA |
| USAKK | Akhiok | AK |
| USKKI | Akiachak | AK |
| USAKI | Akiak | AK |
| USAKO | Akron | CO |
| USAK5 | Akron | IA |
| USAKC | Akron | IN |
| USAKA | Akron | MI |
| USAKR | Akron | NY |
| USAKH | Akron | OH |
| USARN | Akron | PA |
| USKQA | Akutan | AK |
| USA9L | Alabama | NY |
| USZAC | Alabama City | AL |
| USAA2 | Alabama Pt. | AL |
| USLBA | Alabaster | AL |
| USAHU | Alachua | FL |
| USDNJ | Aladdin | WY |
| USAUK | Alakanuk | AK |
| USAMC | Alamance | NC |
| USAS7 | Afton | OK |
| USAFT | Afton | TN |