Musselshell County

Musselshell County is a region in south-central Montana characterized by rolling grasslands and the Bull Mountains rising in the southeastern section. The Musselshell River flows through the landscape, shaping the terrain.

The county was created in 1911 from portions of three neighboring counties. Its development followed the arrival of ranching and mining industries in the region.

The Signal Peak Mine continues the region's coal mining heritage, employing 300 workers and maintaining the community's connection to natural resource industries.

Roundup serves as the administrative center where most services are located. Exploring the area works best by car, as communities are spread across open terrain.

The Musselshell River got its name in 1805 when Lewis and Clark discovered numerous freshwater mussels along its banks. This discovery connected the territory's identity to early exploration.

Location: Montana

Inception: 1911

Capital city: Roundup

Shares border with: Petroleum County, Yellowstone County, Rosebud County, Fergus County, Golden Valley County

Website: http://mt.gov/maco/Counties/Musselshell.htm

GPS coordinates: 46.49000,-108.40000

Latest update: December 10, 2025 16:02