| Code | Name | Region |
|---|---|---|
| USA2O | Angeles Oaks | CA |
| USAJC | Angelica | NY |
| US4NV | Angels Camp | CA |
| USANG | Angier | NC |
| USAGX | Angleton | TX |
| USANQ | Angola | IN |
| USZAI | Angola | LA |
| USANH | Angola | NY |
| USA3D | Andale | KS |
| USADL | Andalusia | AL |
| USUSQ | Andalusia | IL |
| USANE | Anderson | AL |
| USHJG | Anderson | CA |
| USAID | Anderson | IN |
| USANO | Anderson | MO |
| USNDE | Anderson | NY |
| USDQO | Anderson | OH |
| USAND | Anderson | SC |
| US9AN | Anderson | TX |
| USAEQ | Anderson City | GA |
| USUBK | Andersonville | GA |
| USAOZ | Andersonville | TN |
| USAJS | Andes | NY |
| US6VR | Andover | CT |
| USAXZ | Andover | KS |
| USANR | Andover | MA |
| USAD7 | Andover | MN |
| UST3G | Andover | NH |
| USAOS | Amook | AK |
| USARY | Amory | MS |
| USXBD | Ampthill | VA |
| US774 | Amsterdam | MO |
| USAMS | Amsterdam | NY |
| USA4N | Anaconda | MT |
| USOTS | Anacortes | WA |
| USNDV | Anacostia | DC |
| USNKO | Anadarko | OK |
| USANA | Anaheim | CA |
| USA79 | Anahola | HI |
| USAQH | Anahuac | TX |
| USAKP | Anaktuvuk | AK |
| USA56 | Analomink | PA |
| USAQF | Anamoose | ND |
| USAAB | Anamosa | IA |
| USACP | Anchor Point | AK |
| USANC | Anchorage | AK |
| USAHF | Anchorville | MI |
| USACQ | Ancram | NY |
| USAMW | Ames | IA |
| USA7K | Ames | OK |