- Coolidge Springs
- Coon Island
- Cooper
- Cooper
- Cooperstown
- Copco
- Copeland
- Copic
- Copper City
- Copper City
- Copper Cove Subdivision
- Copper Cove Village
- Coppervale
- Copple Place
- Coram
- Cordelia
- Cordero Junction
- Cornell
- Cornell
- Cornwall
- Corona del Mar
- Coronado Cays
- Corporal
- Corral de Tierra
- Cortena
- Cortez
- Cory
- Coso
- Coso Junction
- Cosumne