Population5,582 (2025 estimate)
Prairie Horizons and a Working River Heritage
Musselshell County, MontanaExplore Musselshell County, Montana, through Roundup, the Musselshell River valley and the nearby Bull Mountains. This guide brings local places and practical public resources together so you can plan an outing, find a service or get to know the area. Start with Roundup, the county seat, then explore the communities and landscapes around it. Follow the linked organizations for current schedules, access details and the information you need before heading out.
County at a Glance
Population5,582 (2025 estimate)
County seatRoundup
Largest communityRoundup
Established1911
ZIP coverage12
Total area1,871.7 sq mi (land and water; 2020 boundary data)
Major routesUS 87, US 12
Area code406Meet Local Businesses
Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.

Musselshell County
Musselshell County was established in 1911, with Roundup as its county seat. The river gives the county its name, while cattle ranching, farming, coal and railroad connections helped shape its economy and communities. The Bull Mountains add wooded and rocky terrain to the surrounding prairie. Roundup’s historic identity reflects the region’s livestock connections, and smaller communities contribute to the county’s broader story. Local museums, public offices and community events offer useful ways to understand a place where working landscapes remain central to daily life.
Daily routines often involve distance, familiar community connections and attention to changing weather. Roundup provides the county’s main concentration of public services, while residents elsewhere plan trips around work, school and supplies. Community markets and local events bring people together, and the historical museum provides context for the area’s development. Use the county’s current government website for department information, check travel conditions before longer drives, and confirm the dates and operating hours of individual attractions and businesses.
What shapes us
Living Heritage
Discover how cattle ranching, coal mining and railroad-era community growth helped shape local identity. Historic places and community organizations offer starting points for understanding the county’s past and its continuing story.
Working Landscapes
Explore the Musselshell Valley Historical Museum and the Bull Mountains landscape alongside the landscapes that support everyday life. Local businesses and outdoor destinations connect the county’s natural setting with practical work and recreation.
Community Connections
Ranching routines, community markets, local history and small-town events bring residents and visitors into the same local places. Follow current programs and schedules to find opportunities that match your interests and the season.
Musselshell County in Pictures
A closer look at local places and landscapes.
Commissioners October 9, 2026 Agenda
MUSSELSHELL COUNTY COMMISSIONER’S OCTOBER 9th, 2026, AGENDA CALL TO ORDER 8:30 Public comment on the Growth Policy…
Read the Story Oct 7, 2026 • 2 min readAround Musselshell County
Stories from every corner of Musselshell County.
Commissioners October 9, 2026 Agenda
MUSSELSHELL COUNTY COMMISSIONER’S OCTOBER 9th, 2026, AGENDA CALL TO ORDER 8:30 Public comment on the Growth Policy…
Oct 7, 2026 • 2 min read
Commissioners September 25, 2026 Minutes
The meeting was called to order at 8:30 by Commissioner Goffena and Commissioner Turley & Commissioner Pancratz. Minutes…
Oct 5, 2026 • 2 min read
Commissioners October 2, 2026 Agenda
MUSSELSHELL COUNTY COMMISSIONER’S OCTOBER 2nd, 2026, AGENDA CALL TO ORDER 8:30 Public Comment on any public matter…
Sep 30, 2026 • 2 min read
Commissioners September 18, 2026 Minutes
September 18, 2026 The meeting was called to order at 8:30 by Commissioner Goffena. Commissioner Turley was present.…
Sep 29, 2026 • 2 min read
Commissioners September 25, 2026 Agenda
MUSSELSHELL COUNTY COMMISSIONER’S SEPTEMBER 25th, 2026, AGENDA CALL TO ORDER 8:30 Public Comment on any public matter…
Sep 23, 2026 • 2 min readMeet Local Businesses
Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.
Musselshell County resources
Find official agencies and useful organizations for everyday needs. Open the relevant resource for current services and contact information.
Government
Schools
Hospitals
Public Safety
Disaster and Emergency Services
Emergency Services
State Parks
Trails
Forest Service lands and trails
Utilities
Montana Public Service Commission
Libraries
Courts
Montana Legal Services Association
DMV
Transportation
Postal Services
Veterans
Montana Department of Military Affairs
Employment
Find your way around Musselshell County
Practical answers for residents and visitors.
Frequently asked questions
Start here, then follow the linked organization for current details.
Roundup is the county seat of Musselshell County. Start with Musselshell County government for department contacts and public services.
Start with Musselshell Valley Historical Museum and the other history and cultural destinations in the directory. Confirm each attraction’s current schedule before visiting.
Roundup, Musselshell, Melstone provide starting points within Musselshell County. Each has its own community setting; check local businesses and public resources when planning your route. Follow Musselshell County government for public-service connections.
Use Montana 511 for current conditions. Major routes associated with the county include US 87, US 12; check the specific route before travel.
Start with Office of Public Instruction and the Office of Public Instruction. Confirm enrollment and attendance boundaries with the relevant school district.
Roundup Memorial Healthcare is a local healthcare starting point. Use the provider’s own site for current locations, services and contact information.
Use Montana Fish, Wildlife & Parks and the land-management links in the resources section. Confirm access, permits, fees and seasonal restrictions for the specific destination.
Musselshell County government provides the official starting point for departments, meetings and records. Contact the relevant office to confirm its procedures and opening hours.
Start with Montana Veterans Affairs or VA Montana Health Care for program and location information.
Use MontanaWorks and the Department of Labor & Industry. Check employers directly for current openings and requirements.
Musselshell Valley Historical Museum is one starting point for a family outing in Musselshell County. Use the Kids’ Fun and Outdoor Fun listings, then confirm age suitability, schedules and admission directly with the operator.
Meet Local Businesses
Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.
Find something fun
Explore local placesPlan your next stop with these specific local destinations.

