- Cheeseville
- Cole
- Cottage Grove
- Cougar
- Cove Mobile Villa
- Curtis
- Cannon
- Carquinez Heights
- Chadbourne
- Chipps
- Chipps Island
- Clima
- Collinsville
- Cordelia
- Cordero Junction
- Creed
- Cygnus
- Cadwell
- Camp Meeker
- Camp Rose
- Camp Thayer
- Carmet
- Chianti
- Chiquita
- Cozzens Corner
- Crab Island
- Crab Island (historical)
- Cunningham
- Chemurgic
- Claribel