- Clarinda
- Carroll Community Estates
- Carrollton
- Cleghorn
- Clemons
- Clinton Stock Yards
- Clutier
- Cedar Bluff
- Cedar Valley
- Centerdale
- Coggon
- Cameron
- Cartersville
- Central Heights
- Creamery
- Colesburg
- College Springs
- Colo
- Columbus City
- Columbus Junction
- Colwell
- Conrad
- Chickasaw
- Coppock
- Coralville
- Correctionville
- Corwith
- Corydon
- Coulter
- Council Bluffs