- Calamus
- Callender
- Camanche
- Cantril
- Carter Lake
- Castana
- Cedar Falls
- Cedar Rapids
- Center Junction
- Chariton
- Charles City
- Cherokee
- Churdan
- Clarinda
- Cleghorn
- Clemons
- Clinton Stock Yards
- Clutier
- Coggon
- Colesburg
- College Springs
- Colo
- Columbus City
- Columbus Junction
- Colwell
- Conrad
- Coppock
- Coralville
- Correctionville
- Corwith