- Crucero
- Crystal Falls
- Crystal Lake
- Cubbler Place
- Cucamonga
- Cuesta-by-the-Sea
- Cuesta Oaks
- Cuesta Serena
- Cummings
- Cuna Vista Mobile Home Park
- Cunard
- Cunningham
- Curlew
- Curry Village
- Curtis
- Curtis Creek Ranch
- Cushenbury
- Cushing
- Cuttings Wharf
- Cuyama
- Cygnus
- Cypave
- Cypress Grove
- Cypress Point Rock
- Calimesa
- Calipatria
- Calistoga
- Calwa
- Camarillo
- Cambria