- Coburn
- Coburn Gore
- Codyville
- Colbeth Rock
- Colby
- Cold Brook
- Cole Corner
- Coles
- College Island
- Colt Head Island
- Columbia
- Columbia Falls
- Columbus Island
- Combs Island
- Compass Island
- Conary Island
- Conary Nub
- Concordville
- Connors Corner
- Convene
- Cook Island
- Cook Mills
- Cooks Corner
- Cooks Corner
- Coolidge Corner
- Coombs Islands
- Cooper
- Cooper Island
- Coopers Corner
- Coopers Mills