- Cascade Acres Mobile Home Park
- Cascade Valley
- Casino Island
- Casowasco
- Cassadaga
- Cassville
- Castile
- Castle Creek
- Castle Francis Island
- Castle Gate Mobile Home Park
- Castle High Estates
- Castle Hill Houses
- Castle Point
- Castleton Corners
- Castleton-on-Hudson
- Castlewood
- Castorland
- Casual Estates
- Cat Elbow Corner
- Cat Island (historical)
- Catamount Island
- Catatonk
- Catawba
- Catfield
- Catfish Corners
- Catharine
- Catherineville
- Catlin Hill
- Cato
- Caton