- Capistrano Beach
- Cardiff-by-the-Sea
- Carlotta
- Carmel
- Carmel Valley
- Carnelian Bay
- Casa de Oro
- Casitas Springs
- Casmalia
- Caspar
- Cassel
- Castaic
- Castella
- Castle Park
- Caswell
- Catheys Valley
- Cazadero
- Cecilville
- Cedar Glen
- Cedar Grove
- Cedarpines Park
- Cedarville
- Centerville
- Challenge
- Chambless
- Chatsworth
- Chicago Park
- Chilcoot
- China Lake
- Chiriaco Summit