| Code | Name | Region |
|---|---|---|
| USC3B | Cedar Bluffs | NE |
| USNQB | Cedar Brook | NJ |
| USCDC | Cedar City | UT |
| USYXT | Cedar Creek | TX |
| USCRD | Cedar Falls | IA |
| USXDP | Cedar Falls | NC |
| USDGC | Cedar Glen | CA |
| USYCG | Cedar Grove | NC |
| USCED | Cedar Grove | NJ |
| USCGR | Cedar Grove | WI |
| USXZA | Cedar Grove | WV |
| USVRH | Cedar Hill | MO |
| USC88 | Cedar Hill | NC |
| USCX6 | Cedar Hill | TN |
| USZCH | Cedar Hill | TX |
| USZZR | Cedar Hill | TX |
| USCDJ | Cedar Hills | OR |
| USEHS | Cedar Hills | UT |
| USVCC | Cave Creek | AZ |
| USCWJ | Cave Junction | OR |
| US4CS | Cave Spring | AR |
| USVSP | Cave Spring | GA |
| USVRK | Cave-in-rock | IL |
| USCVX | Cavendish | VT |
| USC5T | Cavetown | MD |
| USCYC | Cayce | SC |
| USYU5 | Cayucos | CA |
| USCYG | Cayuga | IN |
| USAYG | Cayuga | NY |
| USCYU | Cayuta | NY |
| USCZ3 | Cazadero | CA |
| USZCZ | Cazenovia | NY |
| USIQC | Cecil | AR |
| USZB2 | Cecil | PA |
| USJIA | Cecilia | KY |
| USCYD | Cecilton | MD |
| USCQ5 | Cedar | MI |
| USCBV | Cedar Bayou | TX |
| USCTA | Catawba | SC |
| USA54 | Catawba | WI |
| USC8A | Catawissa | MO |
| USKWS | Catawissa | PA |
| US8CE | Caterville | MO |
| USCW5 | Cathcart | WA |
| USYCD | Cathedral City | CA |
| US8TX | Catheys Valley | CA |
| USCE9 | Cathlamet | WA |
| USKVT | Catlett | VA |
| USCGK | Catlettsburg | KY |
| US8CL | Catlin | IL |