Founded in March 24, 1913, Stillwater County is one of 56 counties in the state of Montana. Historically, Stillwater County was formed from Carbon County, Sweet Grass County, and Yellowstone County. The city of Columbus is the county seat. With FIPS code of 95, Stillwater County has a population of 9,044 and area of 1,795 square miles (4,649 km2).
List of all cities in Stillwater County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Absarokee, MT | 59001 | 406 |
| Beehive, MT | 59061 | 406 |
| Columbus, MT | 59019 | 406 |
| Fishtail, MT | 59028 | 406 |
| Nye, MT | 59061 | 406 |
| Park City, MT | 59063 | 406 |
| Rapelje, MT | 59067 | 406 |
| Reed Point, MT | 59069 | 406 |