- Colusa Rancheria
- Cortena
- Cabazon
- Calabasas
- Calexico
- California City
- Cactus City
- Cadiz
- Cajon
- Calavo Gardens
- Caliente
- California Hot Springs
- Callahan
- Calpella
- Calpine
- Camden
- Camino
- Camp Nelson
- Camp Pendleton North
- Camp Pendleton South
- Camp Roberts
- Campo
- Campo Seco
- Camptonville
- Canby
- Canoga Park
- Cantil
- Canyon
- Canyon Country
- Capetown