Big Horn County, Montana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 14th-largest in Montana
The population of Big Horn County, Montana is 12,963 as of the 2023 American Community Survey, making it the 14th-largest county in Montana. The median household income is $56,680, the median home value is $148,200, and the median age is 32.3.
The population of Big Horn County has declined 0.9% since 2010 (12,912 → 12,796), a -0.06% annualized rate.
12,963
Population
-0.06%
Annual growth
3
People / sq mi
$56,680
Median Income
$148,200
Median Home Value
Big Horn County covers 4,998 sq mi of land at 2.6 people per square mile.
About Big Horn County, MT
Big Horn County is a county in Montana with a population of 12,963. It ranks #14 among counties in Montana by population. The median age is 32.3, younger than the national median. The population is 49.2% male and 50.8% female.
The median household income in Big Horn County is $56,680, below the US median of $74,580. 18.1% of residents live below the federal poverty level. Home values sit at a median of $148,200, with monthly rent averaging $686. The homeownership rate of 68.2% is higher than the national rate of 64.8%.
Educational attainment in Big Horn County reflects 20.9% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 10.7% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 20.9 minutes each way.
Big Horn County Population History (2010-2024)
The county of Big Horn County had a population of 12,912 in 2010 and 12,796 in 2024, a -0.9% growth over 14 years. The peak was 13,454 in 2017. Average annual growth rate: -0.06%.
12,796
Population (2024)
12,912
Population (2010)
13,454
Peak (2017)
-0.06%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 12,912 |
| 2011 | 13,058 |
| 2012 | 12,996 |
| 2013 | 13,114 |
| 2014 | 13,341 |
| 2015 | 13,310 |
| 2016 | 13,438 |
| 2017 | 13,454 |
| 2018 | 13,305 |
| 2019 | 13,248 |
| 2020 | 13,083 |
| 2021 | 12,894 |
| 2022 | 12,858 |
| 2023 | 12,825 |
| 2024 | 12,796 |
Race & Ethnicity
| White | 28.7% |
| Black or African American | 0.0% |
| Asian | 0.4% |
| Hispanic or Latino (any race) | 68.3% |
| Two or More Races | 0.0% |
Age & Sex
32.3
Median Age
50.8%
Female
49.2%
Male
13.6%
Age 65+
Age Distribution
Children (under 15): 26.2% · Seniors (65+): 13.6%
Income & Poverty
| Median household income | $56,680$-13,242 vs state |
| Mean household income | $70,442 |
| Per-capita income | $22,453 |
| Poverty rate | 18.1%+11.0% vs state |
| Unemployment rate | 8.1% |
| Employment-to-population | 50.7% |
Top Industries by Employment
The largest employment sector in Big Horn County is professional & business services, accounting for 29.7% of workers.
How residents commute
0.1%
Drive alone
3.3%
Carpool
68.3%
Public transit
10.7%
Work from home
20.9 min
Avg commute
Housing
$148,200$-189,900 vs state
Median home value
$686
Median rent
68.2%
Homeownership rate
4,533
Total housing units
81.4%
Occupied
18.6%
Vacant
31.8%
Renter-occupied
Social & access
81.5%
With health insurance
86.9%
With broadband internet
22.8%
Foreign-born
5.0%
Veterans (18+)
12.6%
With a disability
74.9%
Speak language other than English at home
Education
88.5%
High School+
20.9%
Bachelor's+
Largest cities in Montana
Other counties in Montana
Part of Montana
Metro areas in Montana
County rankings
Frequently Asked Questions
Big Horn County, Montana has a population of 12,963 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 14th-largest county in Montana. Population density is 3 people per square mile.
The population of Big Horn County has declined 0.9% since 2010 (12,912 → 12,796), a -0.06% annualized rate.
The median household income in Big Horn County, Montana is $56,680, with mean (average) household income of $70,442 and per-capita income of $22,453. 18.1% of residents live below the federal poverty level.
In Big Horn County, the largest racial and ethnic groups are Hispanic or Latino (68.3%), White (28.7%), Asian (0.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Big Horn County, Montana is 32.3 years. Residents are 50.8% female and 49.2% male.
The median home value in Big Horn County is $148,200 and median monthly rent is $686. 68.2% of occupied housing units are owner-occupied. The county has 4,533 total housing units, 18.6% of which are vacant.
The largest employment sector in Big Horn County, Montana is professional, scientific, and management services, employing 29.7% of workers. The unemployment rate is 8.1%.
Billings is among the largest cities associated with Big Horn County, Montana, with a population of 118,321.
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Statewide data for Montana
Population, race, income, age, and trends across Montana
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.