- Capitola (1,746 Companies)
- Cardiff (18 Companies)
- Cardiff By The Sea (504 Companies)
- Carlotta (20 Companies)
- Carlsbad (8,742 Companies)
- Carmel (1,751 Companies)
- Carmel By The Sea (83 Companies)
- Carmel Valley (508 Companies)
- Carmichael (3,322 Companies)
- Carnelian Bay (91 Companies)
- Carpinteria (1,574 Companies)
- Carson (5,684 Companies)
- Caruthers (135 Companies)
- Casmalia (4 Companies)
- Caspar (16 Companies)
- Cassel (20 Companies)
- Castaic (640 Companies)
- Castella (7 Companies)
- Castro Valley (2,594 Companies)
- Castroville (523 Companies)
- Cathedral City (2,510 Companies)
- Cathedral Cty (2 Companies)
- Catheys Valley (46 Companies)
- Cayucos (268 Companies)
- Cazadero (84 Companies)
- Cedar Glen (41 Companies)
- Cedar Ridge (46 Companies)
- Cedarpines Park (17 Companies)
- Cedarville (30 Companies)
- Century City (20 Companies)
- Ceres (1,858 Companies)
- Cerritos (4,689 Companies)
- Challenge (8 Companies)
- Chatsworth (5,874 Companies)
- Colma (136 Companies)
- Coloma (13 Companies)
- Colton (3,183 Companies)
- Columbia (113 Companies)
- Colusa (878 Companies)
- Commerce (236 Companies)
- Comptche (8 Companies)
- Compton (4,829 Companies)
- Concord (10,131 Companies)
- Cool (137 Companies)
- Copperopolis (337 Companies)
- Corcoran (515 Companies)
- Cordelia (2 Companies)
- Corning (875 Companies)
- Corona (11,178 Companies)
- Corona Del Mar (1,165 Companies)
- Coronado (1,217 Companies)
- Corralitos (1 Company)
- Corte Madera (1,613 Companies)
- Costa Mesa (15,027 Companies)
- Cotati (1,130 Companies)
- Coto De Caza (6 Companies)
- Cottonwood (455 Companies)
- Coulterville (92 Companies)
- Courtland (35 Companies)
- Covelo (81 Companies)
- Covina (4,888 Companies)
- Coyote (13 Companies)
- Crescent City (1,620 Companies)
- Crescent Mills (22 Companies)
- Cressey (2 Companies)
- Crestline (328 Companies)
