How many people live in Blaine County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 6,900 people living in Blaine County, MT. That makes Blaine County the 31st-most populous county in Montana. It is home to 0.6% of people living in the state.
6.9K
population of Blaine County, MT (2024)
0.6%
County share of the Montana population (2024)
About 6,900 people lived in Blaine County, MT in 2024.
Population estimates, 2000–2024
What are Blaine County, MT’s age demographics?
About 1,300 Blaine County, MT residents are aged 65 and older in 2024. That represents 18.3% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 1,900 Blaine County residents, or 27.9% 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 Blaine County, MT's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Blaine County, MT’s racial and ethnic demographics?
Non-Hispanic American Indian and Alaska Native residents make up 48.9% of the Blaine County, MT population, higher than the national share of 0.72%. Blaine 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, Blaine County’s Hispanic population accounts for 2.9%, below the 20% nationwide, and the non-Hispanic white population makes up 44.3% of the county, compared with 57.5% 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.
Blaine County, MT has a higher share of a non-Hispanic American Indian and Alaska Native population than Montana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Blaine County, MT is Chinook with about 1,200 residents in 2024.
Cities and towns in Blaine County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Chinook | 1,162 |
| 2. | Harlem | 757 |
| 3. | Balance of Blaine County | 4,984 |
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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.
