Barrios de Washington O
- Oakbrook (5)
- Ogden (4)
- Old West Side (1)
- Olde Town (3)
- Olympic East (1)
- Olympic West (1)
- Opportunity (3)
- Orchards (3)
- Orchards Area (19)
- Outer Bremerton (13)
- Outer Mercer Island (4)
- Outer Silverdale (12)
- Outlying Issaquah (9)
- Outlying Lynnwood-Snohomish (33)
- Outlying McChord (10)
- Outlying Newcastle (9)
- Outlying Puyallup (26)
- Outlying Vancouver (12)
- Overlake (24)