- Biem
- Big Arm
- Big Arm Mobile Home Park
- Big Island
- Big Marys Island
- Big Pines Mobile Court
- Big Sag
- Big Sandy
- Big Sandy Trailer Court
- Big Sky
- Big Sky Canyon Village
- Big Sky Colonial Manor
- Big Sky Colony
- Big Sky Meadow Village
- Big Sky Mobile Home Court
- Big Sky Mobile Home Park
- Big Sky Mountain Village
- Big Stone Colony
- Big Timber
- Bigfork
- Bigfort
- Bighorn
- Bill Bracket Place
- Billings
- Bing
- Birch Creek Colony
- Bird Island
- Birdseye
- Birney
- Birney Day School