- Cedarbush Island
- Chamberlain
- Christmas Cove
- Clam Island
- Clam Rock
- Cow Island
- Crotch Islands
- Crow Island
- Crow Island
- Cunningham Island
- Castle Island
- Causeway Island
- Center Vassalboro
- Chute Island
- Coles
- Crooked Island
- Cuba Island
- Calderwood Island
- Calderwood Neck
- Caldwell Island
- Calf Island
- Camp Cove Ledge
- Camp Island
- Carvers Island
- Cedar Island
- Cedar Island
- Channel Rock
- Clam Island
- Clark Island
- Combs Island