Roundup is a city located in Montana. With a 2020 population of 1,852, it is the 40th largest city in Montana and the 7905th largest city in the United States. Roundup is currently growing at a rate of 0.11% annually and its population has increased by 3.58% since the most recent census, which recorded a population of 1,788 in 2010. Roundup reached it's highest population of 1,881 in 2011. Spanning over 1 miles, Roundup has a population density of 1,432 people per square mile.
The average household income in Roundup is $44,953 with a poverty rate of 14.03%. The median rental costs in recent years comes to $767 per month, and the median house value is $97,500. The median age in Roundup is 46.1 years, 41.8 years for males, and 49.3 years for females. For every 100 females there are 90.2 males.