- Belle Creek
- Brock Creek
- Benz
- Blatchford
- Bluffport
- Bell Crossing
- Big Sky Mobile Home Park
- Bing
- Bitterroot Court
- Bitterroot Pines
- Beaver Island
- Breakneck Island
- Buella Island
- Burns
- Biem
- Blair
- B and R Subdivision
- Bascom
- Birney Day School
- Bend
- Blanchards Corner
- Big Island
- Bruces Island
- Buxton
- Beehive
- Busteed
- Blackleaf
- Bole
- Babb
- Bannack