- C-Road
- Cabazon
- Cabin Cove
- Cable
- Cabrillo Village
- Cachuma Village
- Cactus
- Cactus City
- Cadenasso
- Cadiz
- Cadwell
- Cahuilla
- Cahuilla Hills
- Cain Rock
- Cairns Corner
- Cajon
- Cajon Junction
- Cal-Ida
- Cal-ore Trail Mobile Estates
- Calabasas
- Calabasas Highlands
- Calada
- Calaveritas
- Calavo Gardens
- Calders Corner
- Caldor
- Caldwell Pines
- Calexico
- Calexico Lodge
- Calflax