| Code | Name | Region |
|---|---|---|
| USCUM | Canaan | CT |
| US8CN | Canaan | ME |
| USNN2 | Canaan | NH |
| USA5A | Canaan | VT |
| USXC2 | Canadian | TX |
| USC9K | Canadian Lakes | MI |
| USCJH | Canajoharie | NY |
| USCFI | Canal Fulton | OH |
| USCMN | Camino | CA |
| USNNI | Camp Dennison | OH |
| USVOK | Camp Douglas | WI |
| USHCD | Camp Hill | AL |
| USXDZ | Camp Hill | PA |
| USCLJ | Camp Lejeune | NC |
| USPPD | Camp Pendleton | CA |
| US3CP | Camp Point | IL |
| USCY7 | Camp Shelby | MS |
| USADW | Camp Springs | MD |
| USCP9 | Camp Verde | AZ |
| USCPB | Campbell | CA |
| USCPL | Campbell | MO |
| USC7B | Campbell | NC |
| USCP8 | Campbell | NE |
| USCPE | Campbell | NY |
| USAPB | Campbell | TX |
| USCEH | Campbell Hall | NY |
| USJPI | Campbell Hill | IL |
| USAR7 | Campbellsburg | IN |
| USAQQ | Camden | ME |
| USCX8 | Camden | MI |
| USVTM | Camden | NC |
| USCDE | Camden | NJ |
| USZCD | Camden | NY |
| USC2D | Camden | OH |
| USCDN | Camden | SC |
| USCAT | Camden | TN |
| USDKN | Camden | TX |
| USCDT | Camdenton | MO |
| USYCN | Cameron | LA |
| USXAO | Cameron | MO |
| USCR6 | Cameron | MT |
| USCMU | Cameron | NC |
| USAQN | Cameron | OK |
| USCXM | Cameron | TX |
| USZCM | Cameron | WI |
| USMHO | Cameron Park | CA |
| USCML | Camilla | GA |
| USIUS | Camillus | NY |
| US3CB | Cambridge | ID |
| US2CB | Cambridge | IL |