How many people live in Musselshell County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 5,500 people living in Musselshell County, MT. That makes Musselshell County the 35th-most populous county in Montana. It is home to 0.48% of people living in the state.
5.45K
population of Musselshell County, MT (2024)
0.48%
County share of the Montana population (2024)
About 5,500 people lived in Musselshell County, MT in 2024.
Population estimates, 2000–2024
What are Musselshell County, MT’s age demographics?
About 1,500 Musselshell County residents are aged 65 and older in 2024. That represents 27.9% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 1,100 Musselshell County residents, or 19.8% of the population, were children under 18. For comparison, the age group represents 20.5% of Montana’s population and 21.6% in the US overall.
A higher share of Musselshell County, MT's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Musselshell County, MT’s racial and ethnic demographics?
Non-Hispanic white residents make up 89% of the Musselshell County population, higher than the national share of 57.5%. Musselshell County also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.7%) than the US overall (0.72%).
In contrast, Musselshell County’s Hispanic population accounts for 4.5%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 1.1% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Musselshell County, MT has a higher share of a non-Hispanic white population than Montana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Musselshell County, MT is Roundup with about 2,000 residents in 2024.
Cities and towns in Musselshell County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Roundup | 2,017 |
| 2. | Melstone | 147 |
| 3. | Balance of Musselshell County | 3,288 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
