[5] Roundup served as a place for cattlemen to "round up" their cattle along the Musselshell River.

From Hell to Breakfast in Old Montana, by Leland Blanchard, tells the story of pioneers who lived and worked in Roundup in the early 1900s.

The two highways pass through Roundup as Main Street and 1st Avenue West.

According to the U.S. Census Bureau, the city has a total area of 1.29 square miles (3.34 km2), all land.

The area has coal mines, which combined with the agriculture, maintain the economy of the town.

[5] Roundup is a hub in Amazon.com's supply chain with a growing industry of prep centers, or businesses that specialize in packing goods to meet the requirements of Amazon's highly automated warehouses.

[14] The Musselshell Valley Historical Museum highlights the early settlement of the area.

Signal Peak Energy largely funded a coal exhibit.

[15] Several recreated locations, such as a hospital, general store, and school, allow visitors to experience life as it was.

[16] The Musselshell River on the southern side of town provides the opportunity for fishing.

Fish in the river include brown trout, smallmouth bass, and catfish.

[19][20] Roundup School District educates students from kindergarten through 12th grade.

KQLJ-LP is a religious channel[25] affiliated with Three Angels Broadcasting Network.