- Cactus Flat
- Cactus Heights
- Cadotte Island (historical)
- Cameron Colony
- Camp Crook
- Camrose Colony
- Canistota
- Canning
- Canova
- Canton
- Capa
- Caputa
- Carlock
- Carlson Island
- Carpenter
- Carter
- Carthage
- Cascade Springs
- Castle Rock
- Castlewood
- Cavour
- Cedar Butte
- Cedar Canyon
- Cedar Creek Island (historical)
- Cedar Grove Colony
- Centerville
- Central City
- Chamberlain
- Chance
- Chancellor