| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Babb | city | Montana | United States | 48.86028 | -113.43583 | 4557 | 61 |
| Bainville | city | Montana | United States | 48.14 | -104.22222 | 2024 | 112 |
| Baird historical | city | Montana | United States | 46.71667 | -113.51667 | 3687 | 210 |
| Baker | city | Montana | United States | 46.36694 | -104.28417 | 2992 | 75 |
| Bakers historical | city | Montana | United States | 48.32083 | -105.88722 | 2598 | 42 |
| Bald Butte | city | Montana | United States | 46.72417 | -112.34556 | 6751 | 194 |
| Ball Place | city | Montana | United States | 45.14139 | -112.15111 | 5600 | 14 |
| Ballantine | city | Montana | United States | 45.94889 | -108.14444 | 3031 | 215 |
| Balmont | city | Montana | United States | 45.62806 | -111.10444 | 5111 | 14357 |
| Bannack | city | Montana | United States | 45.16111 | -112.99472 | 6200 | 45 |
| Barber | city | Montana | United States | 46.31333 | -109.38444 | 3799 | 53 |
| Barite | city | Montana | United States | 46.94528 | -113.43778 | 3704 | 103 |
| Barker | city | Montana | United States | 46.53444 | -111.48861 | 4166 | 182 |
| Barker | city | Montana | United States | 47.07139 | -110.63972 | 5702 | 69 |
| Barr historical | city | Montana | United States | 48.73778 | -107.05333 | 2404 | 19 |
| Barr historical | city | Montana | United States | 48.73333 | -106.98333 | 2503 | 19 |
| Barretts | city | Montana | United States | 45.13139 | -112.73972 | 5272 | 314 |
| Bascom | city | Montana | United States | 46.62611 | -107.75278 | 2998 | 11 |
| Baseline | city | Montana | United States | 45.78389 | -108.7025 | 3385 | 2338 |
| Basin | city | Montana | United States | 46.27139 | -112.26278 | 5337 | 266 |
| Batavia | city | Montana | United States | 48.18194 | -114.41222 | 3198 | 4173 |
| Battrick historical | city | Montana | United States | 46.90333 | -108.73667 | 4124 | 33 |
| Baxter | city | Montana | United States | 47.15056 | -109.43889 | 4045 | 91 |
| Bay Horse | city | Montana | United States | 45.04333 | -105.56639 | 3799 | 14 |
| Baylor | city | Montana | United States | 48.66333 | -106.47889 | 2926 | 35 |
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