Barrios de Massachusetts M
- Magoun Square (114)
- Main Middle (4)
- Malden Center (159)
- Maplewood (86)
- Marina Bay (26)
- McKnight (4)
- Medford Hillside (153)
- Meeting House Hill (33)
- Melrose East Side (7)
- Melrose Highlands (11)
- Memorial Square (1)
- Merrymount (2)
- Metro West (58)
- Metropolitan Hill-Beech St (2)
- Mid-Cambridge (524)
- Mill Pond (3)
- Mishawum (4)
- Mission Hill (3035)
- MIT (1)
- Montclair (20)
- Mount Vernon (4)