Founded in March 7, 1919, Powder River County is one of 56 counties in the state of Montana. Historically, Powder River County was formed from Custer County. The city of Broadus is the county seat. With FIPS code of 75, Powder River County has a population of 1,702 and area of 3,297 square miles (8,539 km2).
List of all cities in Powder River County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Biddle, MT | 59314 | 406 |
| Broadus, MT | 59317 | 406 |
| Olive, MT | 59343 | 406 |
| Otter, MT | 59062 | 406 |
| Powderville, MT | 59345 | 406 |
| Sonnette, MT | 59317 | 406 |