Ohio cities starting with C
- Cable, OH 6
- Cadiz, OH 15
- Caldwell, OH 16
- Caledonia, OH 5
- Cambridge, OH 36
- Camden, OH 11
- Campbell, OH 14
- Canal Fulton, OH 11
- Canal Winchester, OH 27
- Canfield, OH 17
- Canton, OH 157
- Cardington, OH 11
- Carey, OH 12
- Carroll, OH 7
- Carrollton, OH 22
- Castalia, OH 7
- Cedarville, OH 5
- Celina, OH 29
- Centerburg, OH 9
- Centerville, OH 26
- Chagrin Falls, OH 20
- Chardon, OH 23
- Chesapeake, OH 11
- Chesterland, OH 14
- Chillicothe, OH 73
- Cincinnati, OH 671
- Circleville, OH 36
- Clayton, OH 13
- Cleveland, OH 425
- Cleveland Heights, OH 24
- Cleves, OH 9
- Clinton, OH 8
- Clyde, OH 18
- Coal Grove, OH 5
- Columbiana, OH 15
- Columbia Station, OH 9
- Columbus, OH 596
- Columbus Grove, OH 7
- Conneaut, OH 24
- Continental, OH 9
- Coolville, OH 7
- Copley, OH 10
- Cortland, OH 18
- Coshocton, OH 35
- Covington, OH 11
- Crestline, OH 18
- Creston, OH 6
- Crooksville, OH 12
- Cuyahoga Falls, OH 40