- Cabbage Island
- Cadiz
- Cadosia
- Cadyville
- Cagwin Corners
- Cahoonzie
- Cains Corners
- Cairo
- Cairo Junction
- Calcium
- Calcutta
- Caledonia
- Caledonia Mobile Home Park
- Calf Island
- Callanans Corners
- Callicoon
- Callicoon Center
- Calumet Island
- Calverton
- Cambria Center
- Cambria Heights
- Cambridge
- Camby
- Camden
- Camel Island
- Camelot Village
- Camelot Village Mobile Home Park
- Cameron
- Cameron Mills
- Camillus