County · Montana
Sweet Grass County, Montana
Sweet Grass County, Montana. Sweet Grass County had 3,762 residents in 2025 by the Census Bureau's estimate, up 2.2% since 2020, slower than Montana (+5.6%). It holds 2 places (1 city, village or borough and 1 census-designated) and 1 census tract. GEOID 30097.
Residents, July 2025 estimate
3,762
Census Bureau estimate (no margin published)
2020 Census count: 3,678 · ACS 2020-2024: 3,720
Median household income
$77,000
±$10,890 (90% margin)
Montana: $72,509
Median home value
$330,100
±$29,060 (90% margin)
Montana: $375,800
Median gross rent
$1,149
±$103 (90% margin)
Montana: $1,081
How many people live in Sweet Grass County, and is it growing?
The 2020 Census counted 3,678 residents in Sweet Grass County. The Census Bureau estimates 3,762 for July 1, 2025, up 2.2% since 2020, slower than Montana (+5.6%). The 2020-2024 American Community Survey puts the population at 3,720 over 1,856 square miles of land.
| Measure | Sweet Grass County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Total population | 3,720 | 1,116,875 | +50 |
| Households | 1,552±93 | 458,859 | no clear change |
| Average household size | 2.37±0.14 | 2.37 | no clear change |
| Housing units | 1,900±93 | 528,419 | −309 |
Sweet Grass County's population since 2000
From 3,609 in 2000 to 3,762 in 2025: up 4.2%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Sweet Grass County?
Sweet Grass County holds 2 places: 1 city, village or borough (an incorporated place) and 1 census-designated place. The largest is Big Timber with 1,686 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Big Timber | 1,650 | $66,898 |
|---|---|---|
| GreycliffGEOID 3033250 | 89 | $70,417 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Sweet Grass County?
The median resident of Sweet Grass County is 47.0 years old; 20.1% are under 18 and 25.8% are 65 or older. The largest group is non-Hispanic white residents at 90.8%, then non-Hispanic residents of two or more races at 4.4%. 1.3% of residents were born outside the United States.
| Measure | Sweet Grass County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median age | 47.0±2.8 | 40.4 | −5.0 |
| Under 18 years | 20.1%±2.1 pts | 21.0% | – |
| 65 years and over | 25.8%±3.2 pts | 20.1% | – |
| Hispanic or Latino (any race) | 1.2%±0.9 pts | 4.6% | – |
| White alone, not Hispanic | 90.8%±2.0 pts | 83.6% | −3.3 pts |
| Black or African American alone, not Hispanic | 1.0%±1.2 pts | 0.4% | – |
| Asian alone, not Hispanic | 0.2%±0.3 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 1.6%±1.1 pts | 5.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.8 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.4%±1.5 pts | 4.7% | – |
| Some other race alone, not Hispanic | 0.8%±0.7 pts | 0.5% | – |
| Born outside the United States | 1.3%±0.7 pts | 2.3% | – |
| Speak a language other than English at home (age 5+) | 2.7%±1.3 pts | 4.2% | – |
| Civilian veterans (age 18+) | 11.2%±2.5 pts | 9.0% | – |
| With a disability | 17.3%±3.3 pts | 14.5% | – |
| No health insurance coverage | 10.2%±3.6 pts | 8.6% | +4.4 pts |
| High school graduate or higher (age 25+) | 97.1%±1.2 pts | 94.6% | – |
| Bachelor's degree or higher (age 25+) | 24.4%±3.7 pts | 35.2% | no clear change |
| Graduate or professional degree (age 25+) | 6.6%±2.0 pts | 12.0% | – |
| Moved from another state in the past year | 2.8%±1.8 pts | 3.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Sweet Grass County earn?
Half of Sweet Grass County's 1,552 households earn less than $77,000 a year (±$10,890), against $72,509 in Montana. In 2015-2019 the median was $61,394 in 2024 dollars, so it rose by $15,606 after inflation. 7.9% of residents live below the poverty line.
| Measure | Sweet Grass County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $77,000±$10,890 | $72,509 | +$15,606 |
| Mean household income | $102,866±$12,285 | $98,908 | – |
| Per capita income | $44,275±$5,077 | $41,711 | +$7,293 |
| People below the poverty line | 7.9%±3.5 pts | 11.5% | no clear change |
| Children under 18 below the poverty line | 10.2%±10.4 pts | 12.7% | – |
| Households receiving SNAP | 4.6%±2.9 pts | 7.8% | – |
| Households with a broadband subscription | 91.6%±3.9 pts | 89.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Sweet Grass County?
Owners occupy 79.7% of Sweet Grass County's occupied homes and renters 20.3%. The median owner-occupied home is valued at $330,100 by its owner (±$29,060). The median renter pays $1,149 a month including utilities.
| Measure | Sweet Grass County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $330,100±$29,060 | $375,800 | no clear change |
| Median gross rent | $1,149±$103 | $1,081 | +$278 |
| Renters paying 35% or more of income on rent | 18.6%±14.0 pts | 35.5% | – |
| Median monthly owner costs, with a mortgage | $1,682±$158 | $1,798 | – |
| Owner-occupied homes | 79.7%±5.2 pts | 69.2% | +7.4 pts |
| Housing units | 1,900±93 | 528,419 | −309 |
| Homeowner vacancy rate | 0.0%±2.4 pts | 0.9% | – |
| Rental vacancy rate | 7.2%±7.5 pts | 5.3% | – |
| Single-family detached homes | 82.4%±4.3 pts | 68.8% | – |
| Mobile homes | 8.9%±2.8 pts | 9.4% | – |
| Built 2020 or later | 0.3%±0.4 pts | 2.3% | – |
| Built 1939 or earlier | 21.9%±4.0 pts | 12.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Sweet Grass County building?
Builders took permits for 2 new housing units across Sweet Grass County in 2025 (0 single-family), 0.5 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Sweet Grass County get to work?
66.9% of Sweet Grass County's workers drive alone and 16.0% work from home. The average trip to work takes 24.5 minutes.
| Measure | Sweet Grass County | Montana | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.5%±4.2 pts | 62.9% | – |
| Unemployment rate | 1.8%±1.2 pts | 3.6% | – |
| Drove alone to work | 66.9%±5.5 pts | 71.1% | – |
| Carpooled | 9.1%±3.3 pts | 9.7% | – |
| Public transportation | 1.8%±1.3 pts | 0.6% | – |
| Walked | 4.4%±2.1 pts | 3.9% | – |
| Worked from home | 16.0%±4.8 pts | 12.5% | +6.0 pts |
| Mean travel time to work | 24.5 min±3.8 | 19.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Sweet Grass County's census tracts?
Sweet Grass County is a single census tract.
| Tract 967030097967000 | 3,720 | $77,000 |
|---|
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Sweet Grass County compare with Montana's other counties?
| Measure | Rank |
|---|---|
| Population | 39th of 56 |
| Growth 2020-2025 | 31st of 56 |
| Residents per square mile | 34th of 56 |
| Median household income | 6th of 56 |
| Median home value | 17th of 56 |
| Median gross rent | 4th of 56 |
| Poverty rate | 50th of 56 |
| Bachelor's degree or higher | 31st of 56 |
| Median age | 20th of 56 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Sweet Grass County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.