- Collins Corner
- Conspiracy Island
- Copper Works
- Corys Island
- Coury Heights
- Cow Yard
- Cranberry Bog Corner
- Cranes Station
- Crow Island
- Cedar Island
- Chappaquiddick
- Chappaquiddick Island
- Christian Town
- Clevelandtown
- Cuttyhuck Island
- Cuttyhunk Island
- Camp Sea Haven
- Carr Island
- Castle Rock
- Caswell Rock
- Centerville
- Chaces Island
- Childrens Island
- Choate Island
- Chubb Island
- Chubb Islet
- Clifton
- Cliftondale
- Coney Island
- Coney Island Rock