| Locality | Post Code |
|---|---|
| Amsterdam, Gallatin | 59741 |
| Belgrade, Gallatin | 59714 |
| Big Sky, Gallatin | 59716 |
| Bozeman, Gallatin | 59715, 59718, 59772 |
| Gallatin Gateway, Gallatin | 59730 |
| Manhattan, Gallatin | 59741 |
| Three Forks, Gallatin | 59752 |
| Trident, Gallatin | 59752 |
| West Yellowstone, Gallatin | 59758 |
| Willow Creek, Gallatin | 59760 |