Founded in February 7, 1919, Treasure County is one of 56 counties in the state of Montana. Historically, Treasure County was formed from Rosebud County. The city of Hysham is the county seat. With FIPS code of 103, Treasure County has a population of 768 and area of 979 square miles (2,536 km2).
List of all cities in Treasure County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Bighorn, MT | 59010 | 406 |
| Hysham, MT | 59038 | 406 |
| 59076 | 406 | |
| Sanders, MT | 59038 | 406 |
| 59076 | 406 |