| Code | Name | Region |
|---|---|---|
| USKOV | Cove | OR |
| USC28 | Cove City | NC |
| USCP6 | Cove Point | MD |
| USZCJ | Coventry | CT |
| USADO | Coventry | RI |
| US7CY | Coventry | VT |
| USCJV | Covesville | VA |
| USCVQ | Covina | CA |
| USCVF | Covington | GA |
| USOVT | Covington | IN |
| USCZV | Cottonwood | CA |
| USC8D | Cottonwood | ID |
| USCZW | Cottonwood | MN |
| USDGH | Cottonwood Heights | UT |
| US2TT | Cottrellville | MI |
| USCOT | Cotulla | TX |
| USCZQ | Coudersport | PA |
| USOJU | Coulee Dam | WA |
| USJOU | Coulter | IA |
| USKVJ | Coulterville | CA |
| USCV6 | Coulterville | IL |
| USCUC | Counce | TN |
| USCIL | Council | AK |
| USOUC | Council | ID |
| USCBF | Council Bluffs | IA |
| USUGE | Council Grove | KS |
| USCU9 | Country Club Hills | IL |
| USCBJ | Country Side | IL |
| US3CS | Countryside | IL |
| USCBL | Coupeville | WA |
| USCPS | Cosmopolis | WA |
| USCZM | Costa Mesa | CA |
| USIAO | Cotati | CA |
| USOCZ | Coto De Caza | CA |
| USC4C | Cottage City | MD |
| USQGV | Cottage Grove | IL |
| USAGG | Cottage Grove | MN |
| USTGG | Cottage Grove | OR |
| USCG9 | Cottage Grove | TN |
| USCG3 | Cottage Grove | WI |
| US2CH | Cottage Hills | IL |
| USVXO | Cottleville | MO |
| USOTA | Cotton Plant | AR |
| USTL9 | Cotton Valley | LA |
| USCD3 | Cottondale | AL |
| USCTM | Cottondale | FL |
| USOTT | Cottonton | AL |
| USCT4 | Cottontown | TN |
| USJTD | Cottonwood | AL |
| USCTW | Cottonwood | AZ |