Demographics of Granite County, Montana

Granite County, Montana had 3,658 people on July 1, 2025, by the Census Bureau’s estimate: +351 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.

Granite County, in four figures

3,658
Population: July 1, 2025, Vintage 2025 estimate.; +10.6%
Change since July 2020: +351 people.; 53.0 ±1.1
Median age: ACS 2020–⁠2024.; $59,265 ±$11,108
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.

Granite County, Montana's population grew 10.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Granite 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).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Granite County, Montana's population grew 10.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Granite 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	3,307	100.0	100.0
2021	3,361	101.6	100.2
2022	3,488	105.5	100.7
2023	3,592	108.6	101.6
2024	3,639	110.0	102.5
2025	3,658	110.6	103.1

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Population of Granite 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	3,307	+4	+1	0	+4
2021	3,361	+54	−2	+2	+63
2022	3,488	+127	−18	0	+133
2023	3,592	+104	−7	0	+108
2024	3,639	+47	−14	+8	+53
2025	3,658	+19	−15	+8	+26

Age, 2020–2024

The median age is 53.0 ±1.1: for men 54.8 ±1.5 and for women 51.7 ±2.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Granite County by age, ACS 2020–2024
Age	People	Share	Montana	United States
Under 5	147 ±51	4.2% ±1.5	5.2% ±<0.1	5.6% ±<0.1
5 to 17	362 ±69	10.5% ±2.0	15.8% ±0.2	16.3% ±<0.1
18 to 24	253 ±105	7.3% ±3.0	9.0% ±0.2	9.1% ±<0.1
25 to 44	642 ±135	18.5% ±3.9	25.8% ±0.2	26.9% ±<0.1
45 to 64	976 ±120	28.2% ±3.5	24.1% ±0.2	24.8% ±<0.1
65 and over	1,082 ±119	31.3% ±3.4	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $59,265 ±$11,108, and income per person $39,904 ±$6,134, 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 Granite County by income, ACS 2020–2024
Household income	Households	Share	Montana	United States
Under $25,000	298 ±86	19.7% ±5.4	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	309 ±98	20.4% ±6.2	19.4% ±0.5	16.7% ±<0.1
$50,000 to $74,999	291 ±91	19.2% ±5.7	17.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	161 ±53	10.6% ±3.4	13.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	275 ±83	18.2% ±5.2	17.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	112 ±44	7.4% ±2.8	8.2% ±0.3	9.6% ±<0.1
$200,000 or more	68 ±33	4.5% ±2.1	9.0% ±0.3	13.4% ±0.1

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 Granite County by age, ACS 2020–2024
Age	Below poverty	Rate	Montana	United States
All ages	345 ±121	10.2% ±3.6	11.5% ±0.3	12.5% ±0.1
Under 18	0 to 19	0% to 4.0%	12.7% ±0.6	16.1% ±0.1
18 to 59	68 to 244	4.5% to 15.7%	11.7% ±0.4	11.6% ±0.1
60 and over	183 ±78	13.4% ±5.6	10.3% ±0.4	11.0% ±<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%.

Housing, 2020–2024

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Housing in Granite County, ACS 2020–2024
Measure	Granite County	Montana	United States
Housing units	2,602 ±14	528,419 ±3,257	143,775,355 ±10,234
Occupied	58.2% ±5.5	86.8% ±0.5	89.9% ±0.1
Vacant	41.8% ±5.6	13.2% ±0.3	10.1% ±0.1
Owner occupied	77.9% ±5.3	69.2% ±0.6	65.2% ±0.3
Renter occupied	22.1% ±6.9	30.8% ±0.4	34.8% ±0.1
Median home value	$352,700 ±$27,252	$375,800 ±$3,433	$332,700 ±$236
Median gross rent	$675 ±$145	$1,081 ±$14	$1,413 ±$2
Median year built	1980 ±6	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 Granite County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Montana	United States
Hispanic or Latino	31 to 151	0.9% to 4.4%	4.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,115 ±74	90.0% ±2.1	83.6% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	0 to 23	0% to 0.7%	0.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 81	0% to 2.3%	0.8% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	9 to 117	0.3% to 3.4%	5.3% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 5	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 42	0% to 1.2%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	53 to 221	1.5% to 6.4%	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 Granite County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Montana	United States
Born in the state	1,710 ±180	49.4% ±5.2	52.1% ±0.5	57.3% ±<0.1
Born in another state	1,650 ±189	47.7% ±5.5	44.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	2 to 50	0.1% to 1.4%	0.8% ±0.1	1.7% ±<0.1
Born abroad	25 to 127	0.7% to 3.7%	2.3% ±0.1	14.1% ±<0.1
Naturalized citizens	3 to 39	0.1% to 1.1%	1.2% ±0.1	7.4% ±<0.1
Not citizens	9 to 101	0.3% to 2.9%	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%.

Granite County among the counties of Montana

40th of 56 by population, July 2025. Every one is listed on the Montana page.

Counties of Montana near Granite County in population, July 2025
County	July 2025	Change since 2020
Musselshell County	5,582	+17.6%
Toole County	5,211	+4.9%
Mineral County	5,185	+13.5%
Phillips County	4,203	−0.1%
Sweet Grass County	3,762	+2.4%
Granite County	3,658	+10.6%
Sheridan County	3,436	−2.9%
Fallon County	2,959	−2.3%
Judith Basin County	2,162	+6.8%
Meagher County	2,137	+11.2%
Wheatland County	2,100	+1.2%

Elsewhere on the site

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

Data retrieved September 25, 2026