- Coalinga
- Cobb
- Caldwell Pines
- Castle Rock Springs
- Clear Lake Keys
- Clear Lake Riviera
- Clearlake Park
- Cooper
- Crocker Place
- Colma
- Colton
- Colusa
- Commerce
- Compton
- Concow
- Calneva
- Clear Creek
- Constantia
- Coppervale
- Crest
- Crest
- Calabasas Highlands
- Carmenita
- Castaic Junction
- Castle Rock
- Cedar Springs
- Chumash Island
- Church Rock
- Clearwater
- Clement Junction