- MacDowell Colony
- Madbury
- Madison
- Majors Rock
- Mallard Cove
- Manchester
- Maplehaven
- Mapleton
- Maplewood
- Mark Island
- Marlborough
- Marlow
- Marlow Junction
- Marshall Corner
- Marshfield Station
- Martin
- Martin Crossing
- Martins Corner
- Mascoma
- Mason
- Masons
- Massabesic
- Mayhew Island
- Meaderboro Corner
- Meadowbrook
- Melody Island
- Melrose Beach
- Melrose Corner
- Melvin Island
- Melvin Mills