- Marrtown
- Mars Hill
- Mars Hill-Blaine
- Marsh Corner
- Marsh Island
- Marsh Island
- Marsh Island
- Marshall Island
- Marshfield
- Marshville
- Marston Corner
- Martells Mobile Home Court
- Martin
- Martin Corner
- Martin Island
- Martins Corner
- Martinsville
- Mary Jane Island
- Masardis
- Mash Harbor Island
- Mash Island
- Mast Landing
- Masterman Island
- Masters Island
- Mathews Island
- Matinicus
- Matinicus Island
- Matinicus Rock
- Mattanawcook Island
- Mattawamkeag