| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Bradley (historical) | city | Montana | United States | 46.57 | -112.67 | 5321 | |
| Bradman | city | Montana | United States | 46.70 | -113.22 | 4189 | |
| Brady | city | Montana | United States | 48.04 | -111.84 | 3543 | |
| Braggville (historical) | city | Montana | United States | 47.33 | -107.18 | 2831 | |
| Brandenberg | city | Montana | United States | 45.82 | -106.23 | 2798 | |
| Branding Iron Addition | city | Montana | United States | 45.66 | -110.56 | 4501 | |
| Brandon | city | Montana | United States | 45.47 | -112.14 | 5869 | |
| Bredette | city | Montana | United States | 48.51 | -105.30 | 2509 | |
| Brenchley Mobile Home Park | city | Montana | United States | 48.44 | -114.35 | 3349 | |
| Brenna Trailer Court | city | Montana | United States | 48.79 | -105.42 | 2509 | |
| Brewer | city | Montana | United States | 46.14 | -111.40 | 4189 | |
| Bridger | city | Montana | United States | 45.30 | -108.91 | 3707 | |
| Bridger View Trailer Court | city | Montana | United States | 45.70 | -111.02 | 5029 | |
| Brinkman (historical) | city | Montana | United States | 48.29 | -110.63 | 2854 | |
| Brisbin | city | Montana | United States | 45.52 | -110.61 | 5029 | |
| Broadhead (historical) | city | Montana | United States | 48.24 | -112.39 | 4189 | |
| Broadus | city | Montana | United States | 45.44 | -105.41 | 3349 | |
| Broadview | city | Montana | United States | 46.10 | -108.88 | 4189 | |
| Broadwater | city | Montana | United States | 46.60 | -112.09 | 4366 | |
| Brock Creek | city | Montana | United States | 46.60 | -112.86 | 5029 | |
| Brockton | city | Montana | United States | 48.15 | -104.92 | 1938 | |
| Brockway | city | Montana | United States | 47.30 | -105.76 | 2588 | |
| Brooks | city | Montana | United States | 47.20 | -109.42 | 4189 | |
| Brookside (historical) | city | Montana | United States | 48.09 | -108.32 | 2778 | |
| Brorson (historical) | city | Montana | United States | 47.78 | -104.29 | 2509 | |
| Browning | city | Montana | United States | 48.56 | -113.01 | 4386 | |
| Bruce (historical) | city | Montana | United States | 47.25 | -107.42 | 3349 | |
| Bruce Place | city | Montana | United States | 46.29 | -110.86 | 5400 | |
| Brunelda (historical) | city | Montana | United States | 46.90 | -107.27 | 3349 | |
| Bruno | city | Montana | United States | 46.37 | -110.63 | 5869 | |
| Brusett | city | Montana | United States | 47.43 | -107.27 | 3349 | |
| Bryson | city | Montana | United States | 47.42 | -115.58 | 4189 |