Roundup is a city in and the county seat of Musselshell County, Montana, United States. The population was 1,742 as of the 2020 census. It has a Commissioner-Executive form of government. and now drives happen annually.
The post office opened in 1883. In 1907, the Milwaukee Road reached Roundup.
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.
Geography
Roundup is located in west-central Musselshell County. U.S. Routes 12 and 87 pass through the city. US 12 leads east to Forsyth and west to Harlowton, while US 87 leads northwest to Lewistown and south to Billings. 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 , all land.
|source 2 = National Weather Service (mean maxima and minima 1981–2010)