- Cabbage Island
- Callanans Corners
- Carmen Courts
- Cedar Hill
- Central Square Mobile Home Park
- Clarksville
- Crescent Station
- Ceres
- Castle Hill Houses
- Chimney Sweeps Islands
- City Island
- Clason Point
- Co-Op City
- Country Club
- Cascade Valley
- Center Lisle
- Center Village
- Chenango Forks
- Choconut Center
- Collier Island
- Conklin Center
- Conklin Forks
- Conklin Island
- Conklin Station
- Country Manor
- Creekside Village
- Crocker Island
- Cadiz
- Carroll
- Carrollton