Ohio
- Cable
- Cadiz
- Cairo
- Caldwell
- Caledonia
- Cambridge
- Camden
- Cameron
- Camp Dennison
- Campbell
- Canal Fulton
- Canal Winchester
- Canfield
- Canton
- Carbon Hill
- Carbondale
- Cardington
- Carey
- Carroll
- Carrollton
- Casstown
- Castalia
- Catawba
- Cecil
- Cedarville
- Celina
- Centerburg
- Chagrin Falls
- Chandlersville
- Chardon
- Charm
- Chatfield
- Chauncey
- Cherry Fork
- Chesapeake
- Cheshire
- Chester
- Chesterhill
- Chesterland
- Chesterville
- Chickasaw
- Chillicothe
- Chilo
- Chippewa Lake
- Christiansburg
- Cincinnati
- Circleville
- Clarington
- Clarksburg
- Clarksville
- Clay Center
- Clayton
- Cleveland
- Cleves
- Clifton
- Clinton
- Cloverdale
- Clyde
- Coal Run
- Coalton
- Coldwater
- Colerain
- College Corner
- Collins
- Collinsville
- Colton
- Columbia Station
- Columbiana
- Columbus
- Columbus Grove
- Commercial Point
- Conesville
- Conneaut
- Conover
- Continental
- Convoy
- Coolville
- Corning
- Cortland
- Coshocton
- Covington
- Creola
- Crestline
- Creston
- Crooksville
- Croton
- Crown City
- Cuba
- Cumberland
- Curtice
- Custar
- Cutler
- Cuyahoga Falls
- Cygnet
- Cynthiana