- Cahuilla Hills
- Calimesa Mobile Home Ranch
- Camelot Hills
- Carefree Mobile Village
- Casa Loma
- Country Road Estates
- Cox
- Crestmore
- Centralia
- Chain Island
- Citrus
- Coffing
- Cosumne
- Chittenden
- Cottage Corners
- Cajon Junction
- Calada
- Calico
- Calzona
- Chambless
- Chase
- Chino Hills
- Copper City
- Cosy Dell
- Crestmore
- Cronese Valley
- Cross Roads
- Cushenbury
- Calexico Lodge
- Cameron Corners