Washington Neighborhoods O
- Ogden (7)
- Old Evergreen Highway (2)
- Old West Side (1)
- Olde Town (5)
- Olympic West (1)
- Opportunity (6)
- Orchards Area (23)
- Outer Bremerton (22)
- Outer Mercer Island (11)
- Outer Silverdale (20)
- Outlying Issaquah (4)
- Outlying Lynnwood-Snohomish (35)
- Outlying McChord (16)
- Outlying Newcastle (10)
- Outlying Puyallup (22)
- Outlying Vancouver (18)
- Overlake (25)