- Cadotte Island (historical)
- Cameron Colony
- Camrose Colony
- Canning
- Capa
- Caputa
- Carlock
- Carlson Island
- Carpenter
- Carter
- Cascade Springs
- Castle Rock
- Cedar Butte
- Cedar Canyon
- Cedar Creek Island (historical)
- Cedar Grove Colony
- Chance
- Chase
- Chautauqua
- Cherry Creek
- Chester
- Cheyenne Crossing
- Chicot Island (historical)
- Claremont Colony
- Clark Colony
- Clarkson Addition
- Clay Point
- Clayton
- Clearfield
- Clearfield Colony