- Capitol Oaks
- Capri Village
- Carbon
- Cardiff
- Cardinal Court
- Carillon
- Carle Springs
- Carlsburg
- Carlye Subdivision
- Carman
- Carpenter
- Carr Island
- Carriage Lane Estates
- Carroll Island
- Carroll Island
- Carroll Island (historical)
- Carthage Lake
- Cartter
- Cascade
- Cash Island
- Casner
- Caspars
- Castle Fin
- Castle Junction
- Castleton
- Castor Township
- Catharine
- Caton Farm
- Cayuga
- Cazenovia