Barrios de Pennsylvania M
- Main Line-Delaware (10)
- Manayunk (73)
- Manchester (10)
- Manheim/Lititz (9)
- Mantua (63)
- Market Square (10)
- Marshall-Shadeland (9)
- Marvintown (6)
- Mayfair (3)
- McKees Rocks (25)
- McKeesport-White Oak (17)
- Mechanicsville (1)
- Mid City Erie (3)
- Midtown Harrisburg (15)
- Midtown Village (77)
- Millersville/Conestoga/Willow St (2)
- Minooka (1)
- Morningside (12)
- Mount Hope (1)
- Mount Lebanon (19)
- Mount Washington (30)
- Mt Oliver Boro (7)
- Mulberry And Green (1)
- Munhall (7)
- Musser Park (7)
- Mussertown (1)