- Chesterville
- Chestnut
- Clare
- Clark Center
- Claytonville
- Cloverdale
- Collison
- Colusa
- Cornland
- Cottage Hills
- Cottonwood
- Cropsey
- Clark Island
- Campton
- Carthage Lake
- Castor Township
- Clifford Island
- Collins
- Craigel Island
- Crains Island
- Campbells Island
- Carr Island
- Castle Junction
- Cedar Brook
- Carbon
- Centerville Station
- Crest Hill
- Cornerville
- Cottage Grove
- Cascade