Founded in March 24, 1913, Sheridan County is one of 56 counties in the state of Montana. Historically, Sheridan County was formed from Valley County. The city of Plentywood is the county seat. With FIPS code of 91, Sheridan County has a population of 3,527 and area of 1,677 square miles (4,343 km2).
List of all cities in Sheridan County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Antelope, MT | 59211 | 406 |
| Dagmar, MT | 59219 | 406 |
| Homestead, MT | 59242 | 406 |
| Medicine Lake, MT | 59247 | 406 |
| Outlook, MT | 59252 | 406 |
| Plentywood, MT | 59254 | 406 |
| Raymond, MT | 59256 | 406 |
| Redstone, MT | 59257 | 406 |
| Reserve, MT | 59258 | 406 |
| Westby, MT | 59275 | 406 |