- Cabin City
- Cabin Creek
- Calais
- Calamity Janes Trailer Court
- Caldwell
- Callows Island
- Calvert
- Calypso
- Camas
- Camas Prairie
- Cameron
- Cameron Crossing
- Cameron Park
- Camona
- Camp Three
- Campbell Place
- Canton
- Canyon Creek
- Canyon Creek Boat Landing
- Canyon Ferry
- Canyon View Trailer Court
- Capitol
- Carbella
- Carbert
- Carbert
- Carbon Hill Trailer Court
- Cardwell
- Carlton
- Carlyle
- Carney