- Calcutta
- Canal Fulton
- Canal Winchester
- Canfield
- Canton
- Cardington
- Carey
- Casstown
- Castalia
- Cedarville
- Celina
- Centerburg
- Chagrin Falls
- Chardon
- Chatfield
- Chauncey
- Cherry Fork
- Chesterhill
- Chesterland
- Cheviot
- Chickasaw
- Chillicothe
- Chilo
- Chippewa Lake
- Chippewa-on-the-Lake (historical)
- Choctaw Lake
- Cincinnati
- Circleville
- Clarington
- Clay Center