- Coos Junction
- Copperville
- Cornish Center
- Cornish City
- Cornish Flat
- Cornish Mills
- Cove Island
- Cow Island
- Cowbell Corners
- Crane Crossing
- Creek Area
- Crescent Lake
- Cricket Corner
- Crockett Corner
- Crocketts Crossing
- Croydon
- Croydon Flat
- Crystal
- Curriers Mobile Home Park
- Curtis Corner
- Curtis Corner
- Cushman
- Cut Island
- Cutter Hill