- Cleveland
- Clinton
- Clyde
- Cuba
- Cabbage Island
- Cadiz
- Cadosia
- Cadyville
- Cagwin Corners
- Cahoonzie
- Cains Corners
- Cairo Junction
- Calcutta
- Caledonia Mobile Home Park
- Calf Island
- Callanans Corners
- Callicoon Center
- Calumet Island
- Cambria Center
- Cambria Heights
- Camby
- Camel Island
- Camelot Village
- Camelot Village Mobile Home Park
- Cameron
- Cameron Mills
- Camp Hill
- Camp Island
- Camp Islands
- Camp Lakeland