| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Buckingham | city | Montana | United States | 46.52 | -111.17 | 5869 | |
| Buell | city | Montana | United States | 45.79 | -111.32 | 4373 | |
| Buelow | city | Montana | United States | 48.56 | -110.84 | 3398 | |
| Bueno Vista Acres Trailer Court | city | Montana | United States | 45.85 | -111.04 | 5029 | |
| Buffalo | city | Montana | United States | 46.82 | -109.83 | 4340 | |
| Buford (historical) | city | Montana | United States | 47.29 | -115.15 | 4189 | |
| Bull Mountain | city | Montana | United States | 46.02 | -107.86 | 2883 | |
| Bundy | city | Montana | United States | 46.29 | -108.78 | 3438 | |
| Burdick Place | city | Montana | United States | 45.17 | -112.21 | 6118 | |
| Burlington (historical) | city | Montana | United States | 46.01 | -112.59 | 5869 | |
| Burnham | city | Montana | United States | 48.56 | -109.89 | 2598 | |
| Burns | city | Montana | United States | 47.38 | -104.41 | 1998 | |
| Burns Trailer Court | city | Montana | United States | 48.59 | -109.23 | 2509 | |
| Burnt Creek (historical) | city | Montana | United States | 46.02 | -107.23 | 3405 | |
| Burnt Fork (historical) | city | Montana | United States | 46.46 | -113.94 | 4396 | |
| Burton (historical) | city | Montana | United States | 47.89 | -112.11 | 4189 | |
| Busby | city | Montana | United States | 45.54 | -106.96 | 3503 | |
| Busch | city | Montana | United States | 45.80 | -111.08 | 4557 | |
| Busteed | city | Montana | United States | 45.94 | -109.35 | 4199 | |
| Butchertown (historical) | city | Montana | United States | 46.04 | -112.54 | 6709 | |
| Butte | city | Montana | United States | 46.00 | -112.53 | 5869 | |
| Butte Creek | city | Montana | United States | 48.88 | -105.85 | 2598 | |
| Butte Creek (historical) | city | Montana | United States | 47.48 | -107.25 | 2913 | |
| Butte-Silver Bow | city | Montana | United States | 46.00 | -112.53 | 5869 | |
| Butte-Silver Bow (balance) | city | Montana | United States | 45.90 | -112.66 | 5980 | |
| Buxton | city | Montana | United States | 45.94 | -112.71 | 5902 |