Barrios de Pennsylvania M
- Main Line-Delaware (14)
- Manayunk (102)
- Manchester (11)
- Manheim/Lititz (9)
- Mantua (76)
- Market Square (7)
- Marshall-Shadeland (6)
- Marvintown (2)
- Mayfair (14)
- McKees Rocks (29)
- McKeesport-White Oak (15)
- Mechanicsville (1)
- Mid City Erie (3)
- Midtown Harrisburg (14)
- Midtown Village (97)
- Millersville/Conestoga/Willow St (1)
- Millvale (7)
- Minooka (2)
- Morningside (11)
- Mount Hope (1)
- Mount Lebanon (18)
- Mount Washington (48)
- Mt Oliver (1)
- Mt Oliver Boro (5)
- Mulberry And Green (1)
- Munhall (9)
- Musser Park (12)
- Mussertown (1)