| Code | Name | Region |
|---|---|---|
| USCCL | Chocolate Bayou | TX |
| USCQW | Chocowinity | NC |
| USCKW | Choctaw | MS |
| USHW9 | Choctaw | OK |
| USCIV | Chomley | AK |
| USQHP | Chopin | LA |
| USC8H | Choteau | MT |
| USUDR | Choudrant | LA |
| USC2H | Chouteau | OK |
| USCWC | Chowchilla | CA |
| USIEM | Chriesman | TX |
| USHJ9 | Chrisman | IL |
| USIYY | Chrisney | IN |
| USIIZ | Christiana | DE |
| USCT7 | Christiana | PA |
| USCBG | Christiansburg | VA |
| USC8E | Christine | TX |
| US3CH | Christmas | MI |
| USQZF | China | ME |
| USZHO | China | TX |
| USHNO | China Grove | NC |
| USC3K | China Lake | CA |
| USC32 | China Township | MI |
| USWAL | Chincoteague | VA |
| USZB6 | Chinese Camp | CA |
| USH5C | Chinle | AZ |
| USCNO | Chino | CA |
| USCH3 | Chino Hills | CA |
| USCIO | Chino Valley | AZ |
| USCJC | Chinook | WA |
| USIPY | Chipley | FL |
| USCPF | Chippewa Falls | WI |
| USHGC | Chisago City | MN |
| USCZN | Chisana | AK |
| USQCI | Chisholm | MN |
| USHIB | Chisholm-hibbing Apt | MN |
| USCZO | Chistochina | AK |
| USCXC | Chitina | AK |
| USCIC | Chico | CA |
| USC8I | Chico | TX |
| USCEF | Chicopee | MA |
| USCCE | Chicopee | MO |
| USCF8 | Chiefland | FL |
| USKCL | Chignik | AK |
| USZCG | Childersburg | AL |
| USCDS | Childress | TX |
| USCDP | Childs | PA |
| USCWE | Chilhowie | VA |
| USCII | Chili | NY |
| USCH2 | Chillicothe | IL |