Musselshell County is named for the Musselshell River which was named by the Lewis and Clark Expedition due to mussels found on the banks of the river.
Surrounding County Courthouses:
N – Fergus County and Petroleum County
E – Rosebud County and Treasure County
Created: February 11, 1911 
County Seat:
Roundup 1911 – present
County Courthouse – Roundup
Location: 506 Main Street / 5th Avenue East
Built: 1939 – 1940
Style: Art Deco
Architect: J G Link of Billings
Contractor: Lovering Construction Company of St. Paul, Minnesota
Description: The building faces west and is a two story dark red colored brick and concrete structure.The building is located on landscaped grounds in the center of Round Up. The west front of the rectangular shaped building has a projecting center section with six vertical concrete pillars with the entrance at the center. The roof line is flat.
See: The architect, John G Link of Montana ( in association with Charles S Haire and others ) designed courthouses in Montana in Big Horn County, Carter County, Custer County, Dawson County, Granite County, McCone County, Richland County, Rosebud County, Sheridan County and Silver Bow County; in Oregon in Jackson County and in Wyoming in Park County, Sheridan County and Washakie County.
History: The county was created in 1911 and Round Up was selected as the county seat. The first courthouse was a two story rectangular structure. The second and present courthouse was constructed in 1939 to 1940.
County Courthouse - Roundup
Commissioner Minutes – contractor
Photos taken 2011