- Brown Island
- Brown Lake
- Browns Island
- Browns Island
- Browns Point
- Brownstown
- Brownsville
- Bruce
- Bruceport
- Brush Prairie
- Bryant
- Bryn Mawr
- Bryn Mawr-Skyway
- Buck Island
- Buckeye
- Buckhorn
- Buckley
- Bucoda
- Buena
- Buenna
- Bunk Foss
- Bunker
- Bunker Hill
- Burbank
- Burbank Heights
- Burien
- Burke Island
- Burley
- Burlington
- Burlington Mobile Park