- Ozeana
- Oak Hill
- Oak Park
- Oakwood
- Oakwood
- Odricks Corner
- Old Courthouse
- Old Dominion Gardens
- Old Mill Estates
- Olney Park
- Orchard Bridge
- Oak Shade
- Oak Tree Corner
- Old Conde
- Old Tavern
- Opal
- Oak Hill Estates
- Oak Hill Farms
- Oak Ridge Estates
- Oaks of Shenandoah
- Occoquan Forest
- Occoquan River Hills
- Old Field Estates
- Olde South Estates
- Ole Orchard Estates
- Opequon
- Orangedale
- Oxfordshire
- Olean
- Oak Row