- Cabazon
- Calabasas
- Calexico
- Caliente
- California City
- California Hot Springs
- Calimesa
- Calipatria
- Calistoga
- Callahan
- Calpella
- Calpine
- Calwa
- Camarillo
- Cambria
- Cameron Park
- Camino
- Camp Connell
- Camp Meeker
- Camp Nelson
- Camp Pendleton
- Campbell
- Campo
- Campo Seco
- Camptonville
- Canby
- Canoga Park
- Cantua Creek
- Canyon
- Canyon Country
- Canyon Dam
- Canyon Lake
- Capistrano Beach
- Capitola
- Cardiff
- Cardiff By The Sea
- Cardiff-by-the-sea
- Carlotta
- Carlsbad
- Carmel
- Carmel By The Sea
- Carmel Mountain
- Carmel Valley
- Carmel-by-the-sea
- Carmichael
- Carnelian Bay
- Carpinteria
- Carson
- Caruthers
- Casa De Oro
- Casmalia
- Cassel
- Castaic
- Castella
- Castro Valley
- Castroville
- Catalina
- Cathedral City
- Catheys Valley
- Cayucos
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- Cedar Glen
- Cedar Ridge
- Cedarpines Park
- Cedarville
- Century City
- Ceres
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- Challenge
- Chatsworth
- Cherry Valley
- Chester
- Cheviot Hills
- Chicago Park
- Chico
- Chilcoot
- China Lake
- Chinese Camp
- Chino
- Chino Hills
- Chiriaco Summit
- Chowchilla
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- Chula Vista
- Cisco Grove
- Citrus Heights
- City Of Commerce
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- Clairemont
- Claremont
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- Clayton
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- Cobb
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- Copperopolis
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- Corning
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- Cottonwood
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- Courtland
- Covelo
- Covina
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- Crescent City
- Crescent Mills
- Cressey
- Crest Park
- Crestline
- Creston
- Crockett
- Cromberg
- Crows Landing
- Cudahy
- Culver City
- Cupertino
- Cutler
- Cuyama
- Cypress