- Cairo Junction
- Cauterskill
- Cementon
- Cornwallville
- Coxsackie Island
- Coxsackie
- Cragsmoor
- Camp Island
- Camp Islands
- Cedar Island
- Crotched Pond Island
- Croghan
- Crompond
- Croton-on-Hudson
- Crown Heights
- Crugers
- Cuba
- Cedar Hurst Park Mobile Home Park
- Cedar Lake
- Cedarville Station
- Chepachet
- Columbia Center
- Corrado Corners
- Country Meadows Mobile Home Park
- Cranes Corners
- Cullen
- Curtis
- Cumberland Head
- Cutchogue
- Calf Island