- Cadiz (Population: 3,308)
- Calcutta (Population: 3,491)
- Caldwell (Population: 1,956)
- Cambridge (Population: 11,520)
- Camden (Population: 2,302)
- Campbell (Population: 9,460)
- Canal Fulton (Population: 5,061)
- Canal Winchester (Population: 4,478)
- Canfield (Population: 7,374)
- Canton (Population: 80,806)
- Cardington (Population: 1,849)
- Carey (Population: 3,901)
- Carlisle (Population: 5,121)
- Carrollton (Population: 3,190)
- Cedarville (Population: 3,828)
- Celina (Population: 10,303)
- Centerburg (Population: 1,432)
- Centerville (Population: 23,024)
- Chagrin Falls (Population: 4,024)
- Champion Heights (Population: 4,727)
- Chardon (Population: 5,156)
- Chauncey (Population: 1,067)
- Cherry Grove (Population: 4,555)
- Chesterland (Population: 2,646)
- Cheviot (Population: 9,015)
- Chillicothe (Population: 21,796)
- Choctaw Lake (Population: 1,562)
- Churchill (Population: 2,601)
- Cincinnati (Population: 331,285)
- Circleville (Population: 13,485)
- Clayton (Population: 13,347)
- Cleveland Heights (Population: 49,958)
- Cleveland (Population: 478,403)
- Cleves (Population: 2,790)
- Clinton (Population: 1,337)
- Clyde (Population: 6,064)
- Coal Grove (Population: 2,027)
- Coldwater (Population: 4,482)
- Columbus Grove (Population: 2,200)
- Columbus (Population: 711,470)
- Conneaut (Population: 12,485)
- Continental (Population: 1,188)
- Convoy (Population: 1,110)
- Cortland (Population: 6,830)
- Coshocton (Population: 11,682)
- Covedale (Population: 6,360)
- Covington (Population: 2,559)
- Craig Beach (Population: 1,254)
- Crestline (Population: 5,088)
- Creston (Population: 2,161)
- Cridersville (Population: 1,817)
- Crooksville (Population: 2,483)
- Crystal Lakes (Population: 1,411)
- Cuyahoga Falls (Population: 49,374)
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