Pennsylvania Neighborhoods O
- Oak Lane-East Oak Lane (9)
- Oakwood (3)
- Old City (86)
- Old Uptown Harrisburg (12)
- Olde Kensington (73)
- Olney (20)
- Orchard Park (4)
- Outer Kenhorst/Shillington (2)
- Outer Lancaster (51)
- Outer Wilkes-Barre (8)
- Outer York/Valley View/Grantley (20)
- Outlet Area (1)
- Outlying South Allegheny (17)
- Overbrook (3)
- Overbrook (60)
- Oxford Circle-Castor (19)