- Cholame
- Chubbuck
- Cima
- City Terrace
- Clarksburg
- Clay
- Clear Creek
- Clearlake Highlands
- Clements
- Clifton
- Clipper Mills
- Coarsegold
- Coleville
- College City
- College Heights
- Coloma
- Comptche
- Conejo
- Cool
- Copco
- Cornell
- Corona del Mar
- Coso Junction
- Coulterville
- Courtland
- Cowan Heights
- Cowell
- Coyote
- Coyote Wells
- Crafton