How many people live in Missoula County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 122,500 people living in Missoula County, MT. That makes Missoula County the third-most populous county in Montana. It is home to 10.7% of people living in the state.
123K
population of Missoula County, MT (2024)
10.7%
County share of the Montana population (2024)
About 122,500 people lived in Missoula County, MT in 2024.
Population estimates, 2000–2024
What are Missoula County, MT’s age demographics?
About 22,000 Missoula County residents are aged 65 and older in 2024. That represents 17.9% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 21,500 Missoula County residents, or 17.5% 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 lower share of Missoula County, MT's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Missoula County, MT’s racial and ethnic demographics?
Non-Hispanic white residents make up 87.2% of the Missoula County, MT population, higher than the national share of 57.5%. Missoula County, MT also has a larger share of people identifying as non-Hispanic two or more races (3.1%) than the US overall (2.5%).
In contrast, Missoula County’s Hispanic population accounts for 5.1%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.5% 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.
Missoula 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 Missoula County, MT is Missoula with about 78,200 residents in 2024.
Cities and towns in Missoula County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Missoula | 78,204 |
| 2. | Balance of Missoula County | 44,342 |
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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.
