- Cabazon (Population: 2,229)
- Calabasas (Population: 20,033)
- Calexico (Population: 27,109)
- California City (Population: 8,385)
- Calimesa (Population: 7,139)
- Calipatria (Population: 7,289)
- Calistoga (Population: 5,190)
- Camarillo (Population: 57,077)
- Cambria (Population: 6,232)
- Cambrian Park (Population: 3,258)
- Cameron Park (Population: 14,549)
- Camp Pendleton North (Population: 8,197)
- Camp Pendleton South (Population: 8,854)
- Campbell (Population: 38,138)
- Canyon Lake (Population: 9,952)
- Capitola (Population: 10,033)
- Carlsbad (Population: 78,247)
- Carmel-by-the-Sea (Population: 4,081)
- Carmel Valley Village (Population: 4,700)
- Carmichael (Population: 49,742)
- Carpinteria (Population: 14,194)
- Carson (Population: 89,730)
- Caruthers (Population: 2,103)
- Casa Conejo (Population: 3,180)
- Casa de Oro-Mount Helix (Population: 18,874)
- Castro Valley (Population: 57,292)
- Castroville (Population: 6,724)
- Cathedral City (Population: 42,647)
- Cayucos (Population: 2,943)
- Ceres (Population: 34,609)
- Cerritos (Population: 51,488)
- Challenge-Brownsville (Population: 1,069)
- Channel Islands Beach (Population: 3,142)
- Charter Oak (Population: 9,027)
- Cherry Valley (Population: 5,891)
- Cherryland (Population: 13,837)
- Chester (Population: 2,316)
- Chico (Population: 59,954)
- China Lake Acres (Population: 1,761)
- Chino (Population: 67,168)
- Chino Hills (Population: 66,787)
- Chowchilla (Population: 11,127)
- Chualar (Population: 1,444)
- Chula Vista (Population: 173,556)
- Citrus (Population: 10,581)
- Citrus Heights (Population: 85,071)
- Claremont (Population: 33,998)
- Clayton (Population: 10,762)
- Clearlake (Population: 13,142)
- Clearlake Oaks (Population: 2,402)
- Cloverdale (Population: 6,831)
- Clovis (Population: 68,468)
- Coachella (Population: 22,724)
- Coalinga (Population: 11,668)
- Cobb (Population: 1,638)
- Colfax (Population: 1,496)
- Colma (Population: 1,191)
- Colton (Population: 47,662)
- Columbia (Population: 2,405)
- Colusa (Population: 5,402)
- Commerce (Population: 12,568)
- Compton (Population: 93,493)
- Concord (Population: 121,780)
- Concow (Population: 1,095)
- Copperopolis (Population: 2,363)
- Corcoran (Population: 14,458)
- Corning (Population: 6,741)
- Corona (Population: 124,966)
- Coronado (Population: 24,100)
- Corralitos (Population: 2,431)
- Corte Madera (Population: 9,100)
- Costa Mesa (Population: 108,724)
- Cotati (Population: 6,471)
- Coto de Caza (Population: 13,057)
- Cottonwood (Population: 2,960)
- Country Club (Population: 9,462)
- Covelo (Population: 1,175)
- Covina (Population: 46,837)
- Crescent City (Population: 4,006)
- Crescent City North (Population: 4,028)
- Crest (Population: 2,716)
- Crestline (Population: 10,218)
- Crockett (Population: 3,194)
- Cudahy (Population: 24,208)
- Culver City (Population: 38,816)
- Cupertino (Population: 50,546)
- Cutler (Population: 4,491)
- Cutten (Population: 2,933)
- Cypress (Population: 46,229)
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