| Code | Name | Region |
|---|---|---|
| USAL7 | Aldie | VA |
| USAD8 | Aldine | TX |
| USAD5 | Aledo | IL |
| USAQD | Aledo | TX |
| USWKK | Aleknagik | AK |
| USAED | Aleneva | AK |
| USYAX | Alexander | AR |
| USAEX | Alexander | IA |
| USZXA | Alexander | IL |
| USAKX | Alexander | ND |
| USA37 | Alexander | NY |
| USALX | Alexander City | AL |
| USAXD | Alexandria | IN |
| USAXP | Alexandria | KY |
| USESF | Alexandria | LA |
| USAXN | Alexandria | MN |
| USAXY | Alexandria | MO |
| USAZ4 | Alexandria | OH |
| USAOX | Albion | MI |
| USAB8 | Albion | NE |
| USAON | Albion | NY |
| USAB4 | Albion (erie County) | PA |
| USAO9 | Alborn | MN |
| USQQE | Albright | WV |
| USAB6 | Albrightsville | PA |
| USABQ | Albuquerque | NM |
| USALR | Alburg | VT |
| USEUZ | Alburnett | IA |
| USALU | Alburtis | PA |
| USAC5 | Alcade | NM |
| USXAC | Alcalde | NM |
| USZAK | Alcan | AK |
| USALJ | Alcester | SD |
| USACO | Alcoa | TN |
| USAD4 | Alda | NE |
| US2AD | Aldan | PA |
| USEDH | Alden | IA |
| USDNF | Alden | MN |
| USAYK | Albany | OR |
| USUBE | Albany | TX |
| USAYX | Albany | VT |
| USAYW | Albany | WI |
| USAB2 | Albany | WY |
| USCVO | Albany-corvallis Apt | OR |
| USUAD | Albemarle | NC |
| USLXR | Albers | IL |
| USAEL | Albert Lea | MN |
| USA8A | Alberta | AL |
| USOBQ | Albertson | NY |
| USABV | Albertville | AL |