How many people live in Big Horn County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 12,800 people living in Big Horn County, MT. That makes Big Horn County the 16th-most populous county in Montana. It is home to 1.1% of people living in the state.
12.8K
population of Big Horn County, MT (2024)
1.1%
County share of the Montana population (2024)
About 12,800 people lived in Big Horn County, MT in 2024.
Population estimates, 2000–2024
What are Big Horn County, MT’s age demographics?
About 1,900 Big Horn County, MT residents are aged 65 and older in 2024. That represents 15% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 4,000 Big Horn County residents, or 30.9% 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 Big Horn County, MT's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Big Horn County, MT’s racial and ethnic demographics?
Non-Hispanic American Indian and Alaska Native residents make up 63.8% of the Big Horn County, MT population, higher than the national share of 0.72%. Big Horn County, MT also has a larger share of people identifying as non-Hispanic two or more races (2.9%) than the US overall (2.5%).
In contrast, Big Horn County’s non-Hispanic white population accounts for 26.8%, below the 57.5% nationwide, and the Hispanic population makes up 5.2% of the county, compared with 20% 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.
Big Horn 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 Big Horn County, MT is Hardin with about 3,700 residents in 2024.
Cities and towns in Big Horn County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Hardin | 3,719 |
| 2. | Lodge Grass | 427 |
| 3. | Balance of Big Horn County | 8,650 |
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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.
