- Cody Park
- Cokedale
- Colby
- Cold Spring
- Collbran
- Colona
- Colorado City
- Colorado Springs
- Columbine
- Columbine
- Columbine, Routt
- Columbine Valley
- Columbus
- Comanche
- Comanche Creek
- Comer
- Commerce City
- Como
- Concrete
- Conejos
- Conifer
- Cooper
- Cope
- Copper Mountain
- Copper Spur
- Copperdale
- Cordova Plaza
- Cornelia
- Cornish
- Cortez