Founded in March 5, 1895, Sweet Grass County is one of 56 counties in the state of Montana. Historically, Sweet Grass County was formed from Meagher County, Park County, and Yellowstone County. The city of Big Timber is the county seat. With FIPS code of 97, Sweet Grass County has a population of 3,723 and area of 1,855 square miles (4,804 km2).
List of all cities in Sweet Grass County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Big Timber, MT | 59011 | 406 |
| Greycliff, MT | 59033 | 406 |
| McLeod, MT | 59052 | 406 |
| Melville, MT | 59055 | 406 |