- Mattimo Place
- Maxwell Island
- Mayfield Corner
- Maysville
- Mayville
- McCarty
- McCoy Crossing
- McCuller Island
- McFarland Island
- McFarlands Corner
- McGee Island
- McGlathery Island
- McGraw
- McGregor Mill
- McKeen Crossing
- McKeen Island
- McKeesick Island
- McKinley Estates
- McNally
- McShea
- Meadowbrook
- Meadowview
- Meadowville
- Mechanic Falls
- Meddybemps
- Medford
- Medford Center
- Medomak
- Medway
- Mee Corners