Pennsylvania Neighborhoods O
- Oak Lane-East Oak Lane (14)
- Oak Tree Hollow (1)
- Oakmont (5)
- Old City (102)
- Old Uptown Harrisburg (11)
- Olde Kensington (36)
- Olney (21)
- Orchard Park (4)
- Outer Kenhorst/Shillington (1)
- Outer Lancaster (45)
- Outer Muhlenberg Township (1)
- Outer Wilkes-Barre (7)
- Outer York/Valley View/Grantley (7)
- Outlet Area (1)
- Outlying South Allegheny (19)
- Overbrook (3)
- Overbrook (56)
- Oxford Circle-Castor (17)