Sweet Grass County, Montana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 39th-largest in Montana
The population of Sweet Grass County, Montana is 3,713 as of the 2023 American Community Survey, making it the 39th-largest county in Montana. The median household income is $69,426, the median home value is $295,500, and the median age is 44.0.
The population of Sweet Grass County has grown 3.9% since 2010 (3,617 → 3,757), a +0.27% annualized rate.
3,713
Population
+0.27%
Annual growth
2
People / sq mi
$69,426
Median Income
$295,500
Median Home Value
Sweet Grass County covers 1,856 sq mi of land at 2.0 people per square mile.
About Sweet Grass County, MT
The poverty rate is what most separates Sweet Grass County from the typical county: 3.7% of residents live below the federal poverty line, against 12.4% nationally. Sweet Grass County is a county in Montana with a population of 3,713. It ranks #39 among counties in Montana by population.
Household earnings are middling, with a median of $69,426 — below the US median of $78,538. Poverty is among the lowest of comparable US counties, at 3.7% — below the national 12.4%. The median home value is $295,500, with typical rent around $1,073.
23.1% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is on the higher side at 13.1%, below the national 14.0%, and the average commute runs about 24 minutes each way.
Sweet Grass County Population History (2010-2024)
The county of Sweet Grass County had a population of 3,617 in 2010 and 3,757 in 2024, a 3.9% growth over 14 years. The peak was 3,757 in 2024. Average annual growth rate: 0.28%.
3,757
Population (2024)
3,617
Population (2010)
3,757
Peak (2024)
0.28%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,617 |
| 2011 | 3,584 |
| 2012 | 3,579 |
| 2013 | 3,657 |
| 2014 | 3,637 |
| 2015 | 3,618 |
| 2016 | 3,610 |
| 2017 | 3,668 |
| 2018 | 3,701 |
| 2019 | 3,717 |
| 2020 | 3,670 |
| 2021 | 3,702 |
| 2022 | 3,724 |
| 2023 | 3,749 |
| 2024 | 3,757 |
Race & Ethnicity
| White | 90.6% |
| Black or African American | 1.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 4.4% |
| Two or More Races | 0.0% |
Age & Sex
44.0
Median Age
49.8%
Female
50.2%
Male
23.4%
Age 65+
Age Distribution
Children (under 15): 15.8% · Seniors (65+): 23.4%
Income & Poverty
| Median household income | $69,426$-496 vs state |
| Mean household income | $94,999 |
| Per-capita income | $39,756 |
| Poverty rate | 3.7%-3.4% vs state |
| Unemployment rate | 1.3% |
| Employment-to-population | 60.0% |
Top Industries by Employment
The largest employment sector in Sweet Grass County is agriculture, accounting for 20.6% of workers.
How residents commute
2.2%
Drive alone
3.4%
Carpool
70.3%
Public transit
13.1%
Work from home
23.7 min
Avg commute
Housing
$295,500$-42,600 vs state
Median home value
$1,073
Median rent
76.2%
Homeownership rate
1,929
Total housing units
77.6%
Occupied
22.4%
Vacant
23.8%
Renter-occupied
Social & access
90.8%
With health insurance
91.4%
With broadband internet
45.4%
Foreign-born
9.7%
Veterans (18+)
16.7%
With a disability
96.9%
Speak language other than English at home
Education
96.4%
High School+
23.1%
Bachelor's+
Largest cities in Montana
Other counties in Montana
Part of Montana
Metro areas in Montana
County rankings
Frequently Asked Questions
Sweet Grass County, Montana has a population of 3,713 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 39th-largest county in Montana. Population density is 2 people per square mile.
The population of Sweet Grass County has grown 3.9% since 2010 (3,617 → 3,757), a +0.27% annualized rate.
The median household income in Sweet Grass County, Montana is $69,426, with mean (average) household income of $94,999 and per-capita income of $39,756. 3.7% of residents live below the federal poverty level.
In Sweet Grass County, the largest racial and ethnic groups are White (90.6%), Hispanic or Latino (4.4%), Black or African American (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Sweet Grass County, Montana is 44.0 years. Residents are 49.8% female and 50.2% male.
The median home value in Sweet Grass County is $295,500 and median monthly rent is $1,073. 76.2% of occupied housing units are owner-occupied. The county has 1,929 total housing units, 22.4% of which are vacant.
The largest employment sector in Sweet Grass County, Montana is agriculture, forestry, fishing, and mining, employing 20.6% of workers. The unemployment rate is 1.3%.
Billings is among the largest cities associated with Sweet Grass County, Montana, with a population of 118,321.
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Full rankings of Montana counties
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.