- Caspar
- Cassel
- Castaic
- Castaic Junction
- Castella
- Castle Crag
- Castle Gardens
- Castle Park
- Castle Rock
- Castle Rock
- Castle Rock
- Castle Rock
- Castle Rock Springs
- Castro City
- Castro Valley
- Castroville
- Caswell
- Cat Rock
- Cathedral City
- Catheys Valley
- Catlett
- Cave City
- Cavin
- Cayton
- Cayucos
- Cazadero
- Cecile
- Cecilville
- Cedar Crest
- Cedar Crest