- Cosy Dell
- Cottage Corners
- Cottage Grove
- Cottage Springs
- Cottaneva Needle
- Cottaneva Rock
- Cotton Center
- Cottonwood Estates
- Cougar
- Coulterville
- Counsman
- Country Mobile Estates
- Country Road Estates
- Country Side Mobile Home Park
- Country Villa Estates
- Country Villa Estates Mobile Home Park
- County Center
- Courtland
- Cove Mobile Villa
- Cove Rock
- Cow Creek
- Cowan Heights
- Cowell
- Cox
- Coyote
- Coyote Wells
- Coyoteville
- Cozzens Corner
- Crab Island
- Crab Island (historical)