Barrios de Virginia O
- Oak Grove (2)
- Oakmont (1)
- Oakwood (6)
- Ocean Air (4)
- Old Courthouse (2)
- Old Glebe (1)
- Old North Hampton (3)
- Old Southwest (1)
- Old Town (69)
- Old Town Manchester (25)
- Old Towne Petersburg (9)
- Old Towne Portsmouth (8)
- Olde Hampton (1)
- Olde Huntersville (3)
- Oregon Hill (9)
- Outer Ashburn-Sterling (6)
- Outer Greenway-Dulles (5)
- Outer Leesburg (15)
- Outer Reston-Herndon Corridor (7)
- Outlying South (9)
- Oxford (1)
- Oyster Point (4)