- Marston Corner
- Megquier Island
- Moussam
- Murphy Corner
- Madawaska
- Maine
- Maple Grove
- Margison
- Mars Hill-Blaine
- Maysville
- McGraw
- McKeen Crossing
- McKeen Island
- McNally
- McShea
- Michaud Island
- Michigan Settlement
- Molunkus
- Monarda
- Morey Brow
- Moro
- Morris Corner
- Mackworth Island
- Macs Corner
- Mariner
- Mark Island
- Martin Island
- Mast Landing
- McKinley Estates
- Merrill Isle