- Clinton Mills
- Clintonville
- Collins Trailer Court
- Conwells Mobile Home Park
- Coopersville
- Crab Island
- Cherry Creek
- Chestnut Ridge
- Canaan
- Canaan Center
- Chatham Center
- Cherry Hill
- Cheviot
- Churchtown
- Claverack
- Claverack-Red Mills
- Clermont
- Columbia Villa Mobile Home Park
- Copake
- Copake Falls
- Country Estates East
- Craryville
- Chittenango
- Cheningo
- Cortland West
- Cowles Settlement
- Crains Mills
- Cummings Crossing
- Cuyler
- Clarence Center