- Cape Porpoise
- Cape Rosier
- Cape Wash Island
- Capitol Island
- Caratunk
- Cardville
- Caribou
- Caribou Rock
- Carleton Island
- Carleton Ledges
- Carlisle Island
- Carlow Island
- Carmel
- Carney Island
- Carr Corner
- Carrabassett
- Carriveau Mill
- Carroll
- Carrs Corner
- Carrying Place Island
- Carson
- Carthage
- Carvers Corner
- Carvers Island
- Cary
- Carys Mills
- Casco
- Cash Corner
- Cass Corner
- Castine