- Clark Center
- Clark Island
- Clark Island
- Clarke City
- Clarke's Subdivision
- Clarks Island
- Clarks Mobile Home Park
- Clarksburg
- Clarksburg
- Clarksdale
- Clarksville
- Clarksville
- Clarksville Island
- Clarmin
- Claus
- Clay City
- Claypool
- Claypool Woods
- Clays Prairie
- Claysville
- Clayton
- Claytonville
- Clear Lake
- Cleburne
- Clements
- Cleone
- Cleveland
- Cliffdale
- Clifford
- Clifford Island