| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Bole | city | Montana | United States | 47.71 | -112.01 | 4189 | |
| Bond | city | Montana | United States | 45.31 | -112.67 | 5200 | |
| Bone Crossing | city | Montana | United States | 48.52 | -107.33 | 2509 | |
| Boneau | city | Montana | United States | 48.29 | -109.86 | 3398 | |
| Bonfield | city | Montana | United States | 46.63 | -105.57 | 2509 | |
| Bonner | city | Montana | United States | 46.87 | -113.86 | 3392 | |
| Bonner Junction | city | Montana | United States | 46.86 | -113.88 | 3398 | |
| Bonner Post Office | city | Montana | United States | 46.87 | -113.86 | 3392 | |
| Borax | city | Montana | United States | 47.43 | -115.67 | 4209 | |
| Boston Heights (historical) | city | Montana | United States | 47.51 | -111.25 | 3398 | |
| Boulder | city | Montana | United States | 46.24 | -112.12 | 5029 | |
| Bowdoin | city | Montana | United States | 48.39 | -107.61 | 2509 | |
| Bowler | city | Montana | United States | 45.20 | -108.72 | 5029 | |
| Bowman Place | city | Montana | United States | 45.11 | -112.05 | 6030 | |
| Box Elder | city | Montana | United States | 48.32 | -110.01 | 2680 | |
| Box Elder (historical) | city | Montana | United States | 47.46 | -111.09 | 3517 | |
| Box Elder (historical) | city | Montana | United States | 47.89 | -107.68 | 2509 | |
| Box Elder (historical) | city | Montana | United States | 47.34 | -108.92 | 3471 | |
| Box Springs (historical) | city | Montana | United States | 47.00 | -109.35 | 4199 | |
| Boyd | city | Montana | United States | 45.46 | -109.07 | 4189 | |
| Boyd (historical) | city | Montana | United States | 48.21 | -104.66 | 1948 | |
| Boyes | city | Montana | United States | 45.27 | -105.03 | 3382 | |
| Bozeman | city | Montana | United States | 45.68 | -111.04 | 5029 |