Demographics of Sweet Grass County, Montana

Sweet Grass County, Montana had 3,762 people on July 1, 2025, by the Census Bureau’s estimate: +88 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.

Sweet Grass County, in four figures

3,762
Population: July 1, 2025, Vintage 2025 estimate.; +2.4%
Change since July 2020: +88 people.; 47.0 ±2.8
Median age: ACS 2020–⁠2024.; $77,000 ±$10,890
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.

Sweet Grass County, Montana's population grew 2.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sweet Grass 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

Sweet Grass County, Montana's population grew 2.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sweet Grass 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	3,674	100.0	100.0
2021	3,707	100.9	100.2
2022	3,728	101.5	100.7
2023	3,788	103.1	101.6
2024	3,818	103.9	102.5
2025	3,762	102.4	103.1

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Population of Sweet Grass 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	3,674	−7	−3	0	−4
2021	3,707	+33	−35	+1	+69
2022	3,728	+21	−24	0	+46
2023	3,788	+60	−8	+18	+50
2024	3,818	+30	+2	0	+27
2025	3,762	−56	+2	0	−57

Age, 2020–2024

The median age is 47.0 ±2.8: for men 46.8 ±3.9 and for women 47.6 ±3.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sweet Grass County by age, ACS 2020–2024
Age	People	Share	Montana	United States
Under 5	174 ±50	4.7% ±1.4	5.2% ±<0.1	5.6% ±<0.1
5 to 17	572 ±88	15.4% ±2.4	15.8% ±0.2	16.3% ±<0.1
18 to 24	274 ±83	7.4% ±2.2	9.0% ±0.2	9.1% ±<0.1
25 to 44	753 ±103	20.2% ±2.8	25.8% ±0.2	26.9% ±<0.1
45 to 64	988 ±109	26.6% ±2.9	24.1% ±0.2	24.8% ±<0.1
65 and over	959 ±133	25.8% ±3.6	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $77,000 ±$10,890, and income per person $44,275 ±$5,077, 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 Sweet Grass County by income, ACS 2020–2024
Household income	Households	Share	Montana	United States
Under $25,000	195 ±71	12.6% ±4.5	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	288 ±81	18.6% ±5.1	19.4% ±0.5	16.7% ±<0.1
$50,000 to $74,999	277 ±74	17.8% ±4.7	17.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	246 ±69	15.9% ±4.3	13.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	332 ±76	21.4% ±4.7	17.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	115 ±45	7.4% ±2.9	8.2% ±0.3	9.6% ±<0.1
$200,000 or more	99 ±44	6.4% ±2.8	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 Sweet Grass County by age, ACS 2020–2024
Age	Below poverty	Rate	Montana	United States
All ages	290 ±128	7.9% ±3.5	11.5% ±0.3	12.5% ±0.1
Under 18	29 to 123	4.1% to 16.4%	12.7% ±0.6	16.1% ±0.1
18 to 59	47 to 155	2.7% to 8.7%	11.7% ±0.4	11.6% ±0.1
60 and over	113 ±52	9.6% ±4.2	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 Sweet Grass County, ACS 2020–2024
Measure	Sweet Grass County	Montana	United States
Housing units	1,900 ±93	528,419 ±3,257	143,775,355 ±10,234
Occupied	81.7% ±2.8	86.8% ±0.5	89.9% ±0.1
Vacant	18.3% ±3.9	13.2% ±0.3	10.1% ±0.1
Owner occupied	79.7% ±3.9	69.2% ±0.6	65.2% ±0.3
Renter occupied	20.3% ±5.5	30.8% ±0.4	34.8% ±0.1
Median home value	$330,100 ±$29,060	$375,800 ±$3,433	$332,700 ±$236
Median gross rent	$1,149 ±$103	$1,081 ±$14	$1,413 ±$2
Median year built	1979 ±4	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 Sweet Grass County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Montana	United States
Hispanic or Latino	10 to 80	0.3% to 2.2%	4.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,376 ±73	90.8% ±2.0	83.6% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	0 to 83	0% to 2.2%	0.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 17	0% to 0.5%	0.8% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	19 to 101	0.5% to 2.7%	5.3% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 11	0% to 0.3%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	2 to 58	0.1% to 1.6%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	163 ±57	4.4% ±1.5	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 Sweet Grass County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Montana	United States
Born in the state	1,957 ±181	52.6% ±4.9	52.1% ±0.5	57.3% ±<0.1
Born in another state	1,686 ±178	45.3% ±4.8	44.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	10 to 50	0.3% to 1.3%	0.8% ±0.1	1.7% ±<0.1
Born abroad	21 to 73	0.6% to 2.0%	2.3% ±0.1	14.1% ±<0.1
Naturalized citizens	15 to 67	0.4% to 1.8%	1.2% ±0.1	7.4% ±<0.1
Not citizens	0 to 12	0% to 0.3%	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%.

Sweet Grass County among the counties of Montana

39th of 56 by population, July 2025. Every one is listed on the Montana page.

Counties of Montana near Sweet Grass County in population, July 2025
County	July 2025	Change since 2020
Chouteau County	5,865	−0.8%
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%

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