- Clifton
- Clifton Terrace
- Clifty Heights
- Clinton
- Clintonville
- Cloverdale
- Cloverdale
- Clow Creek Farm
- Coal City
- Coal Creek Island
- Coal Hollow
- Coal Valley
- Coaler
- Coalton
- Coalton
- Coalville
- Coatsburg
- Cobblewood
- Cobden
- Cody
- Coello
- Coffeen
- Colby Point
- Colchester
- Coldbrook
- Coleman
- Coleman
- Coleman Island
- Coles
- Coleta