Demographics of Big Horn County, Montana

Big Horn County, Montana had 12,752 people on July 1, 2025, by the Census Bureau’s estimate: −327 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Big Horn County, in four figures

12,752
Population: July 1, 2025, Vintage 2025 estimate.; −2.5%
Change since July 2020: −327 people.; 31.9 ±0.7
Median age: ACS 2020–⁠2024.; $58,750 ±$2,019
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Big Horn County, Montana's population shrank 2.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Big Horn County, Montana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Big Horn County, Montana's population shrank 2.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Big Horn County, Montana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	13,079	100.0	100.0
2021	12,893	98.6	100.2
2022	12,873	98.4	100.7
2023	12,860	98.3	101.6
2024	12,847	98.2	102.5
2025	12,752	97.5	103.1

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Population of Big Horn County, Montana on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	13,079	−43	+16	0	−56
2021	12,893	−186	−60	−1	−129
2022	12,873	−20	−4	+35	−44
2023	12,860	−13	+43	+16	−70
2024	12,847	−13	+51	0	−64
2025	12,752	−95	+54	−3	−147

Age, 2020–2024

The median age is 31.9 ±0.7: for men 31.2 ±0.8 and for women 32.9 ±1.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Big Horn County by age, ACS 2020–2024
Age	People	Share	Montana	United States
Under 5	916 ±84	7.1% ±0.7	5.2% ±<0.1	5.6% ±<0.1
5 to 17	3,125 ±223	24.2% ±1.7	15.8% ±0.2	16.3% ±<0.1
18 to 24	1,364 ±186	10.6% ±1.4	9.0% ±0.2	9.1% ±<0.1
25 to 44	2,899 ±216	22.5% ±1.7	25.8% ±0.2	26.9% ±<0.1
45 to 64	2,773 ±242	21.5% ±1.9	24.1% ±0.2	24.8% ±<0.1
65 and over	1,814 ±172	14.1% ±1.3	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $58,750 ±$2,019, and income per person $22,861 ±$2,240, in 2024 dollars. The median is $72,509 ±$761 in Montana and $80,734 ±$166 in the United States.

Households by income

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Households in Big Horn County by income, ACS 2020–2024
Household income	Households	Share	Montana	United States
Under $25,000	831 ±170	21.7% ±4.4	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	734 ±149	19.2% ±3.8	19.4% ±0.5	16.7% ±<0.1
$50,000 to $74,999	1,012 ±199	26.4% ±5.1	17.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	444 ±130	11.6% ±3.4	13.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	479 ±142	12.5% ±3.7	17.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	214 ±92	5.6% ±2.4	8.2% ±0.3	9.6% ±<0.1
$200,000 or more	56 to 170	1.5% to 4.4%	9.0% ±0.3	13.4% ±0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Big Horn County by age, ACS 2020–2024
Age	Below poverty	Rate	Montana	United States
All ages	2,780 ±504	22.1% ±4.0	11.5% ±0.3	12.5% ±0.1
Under 18	1,054 ±211	27.3% ±4.8	12.7% ±0.6	16.1% ±0.1
18 to 59	1,242 ±241	20.1% ±3.7	11.7% ±0.4	11.6% ±0.1
60 and over	484 ±171	19.0% ±6.5	10.3% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Big Horn County, ACS 2020–2024
Measure	Big Horn County	Montana	United States
Housing units	4,527 ±19	528,419 ±3,257	143,775,355 ±10,234
Occupied	84.5% ±2.3	86.8% ±0.5	89.9% ±0.1
Vacant	15.5% ±2.3	13.2% ±0.3	10.1% ±0.1
Owner occupied	66.7% ±4.6	69.2% ±0.6	65.2% ±0.3
Renter occupied	33.3% ±4.8	30.8% ±0.4	34.8% ±0.1
Median home value	$143,400 ±$14,230	$375,800 ±$3,433	$332,700 ±$236
Median gross rent	$697 ±$99	$1,081 ±$14	$1,413 ±$2
Median year built	1976 ±3	1981 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Big Horn County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Montana	United States
Hispanic or Latino	610 ±0	4.7% ±<0.1	4.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,476 ±18	27.0% ±0.1	83.6% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	0 to 79	0% to 0.6%	0.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 57	0% to 0.4%	0.8% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	8,534 ±124	66.2% ±1.0	5.3% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 18	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 18	0% to 0.1%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	103 to 321	0.8% to 2.5%	4.7% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Big Horn County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Montana	United States
Born in the state	9,969 ±255	77.3% ±2.0	52.1% ±0.5	57.3% ±<0.1
Born in another state	2,813 ±251	21.8% ±1.9	44.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 18	0% to 0.1%	0.8% ±0.1	1.7% ±<0.1
Born abroad	34 to 184	0.3% to 1.4%	2.3% ±0.1	14.1% ±<0.1
Naturalized citizens	11 to 99	0.1% to 0.8%	1.2% ±0.1	7.4% ±<0.1
Not citizens	0 to 109	0% to 0.8%	1.1% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Big Horn County among the counties of Montana

16th of 56 by population, July 2025. Every one is listed on the Montana page.

Counties of Montana near Big Horn County in population, July 2025
County	July 2025	Change since 2020
Park County	18,214	+5.7%
Hill County	16,167	−0.5%
Sanders County	14,062	+12.9%
Glacier County	13,463	−2.0%
Jefferson County	13,329	+9.8%
Big Horn County	12,752	−2.5%
Custer County	12,034	+1.5%
Fergus County	11,825	+3.1%
Carbon County	11,466	+9.1%
Richland County	11,377	−1.3%
Roosevelt County	10,242	−5.2%

Elsewhere on the site

Rankings this appears in

No. 16 Counties by population in Montana
No. 51 Counties by population growth in Montana

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026