- Chequest
- Cherokee
- Chester
- Chickasaw
- Chillicothe
- Church
- Churchville
- Churdan
- Cincinnati
- Clara
- Clare
- Clarence
- Clarinda
- Clarion
- Clark
- Clarkdale
- Clarksville
- Clay Mills
- Clayton
- Clayton Center
- Clear Creek Mobile Home Park
- Clear Lake
- Clearfield
- Cleghorn
- Clemons
- Clermont
- Cleves
- Cliffland
- Climax
- Climbing Hill