- Cairo
- Calamus
- Caldwell Siding
- Calhoun
- California Junction
- Callender
- Calmar
- Caloma
- Calumet
- Camanche
- Camanche Island
- Cambria
- Cambridge
- Cameron
- Cameron
- Camp Dodge
- Camp Island
- Camp Slough Island
- Campbell
- Canby
- Candlelight Village Mobile Home Park
- Canfield
- Canoe
- Canton
- Cantril
- Capitol Heights
- Carbon
- Carbon
- Carbondale
- Carl