County Maps US

Sweet Grass County, Montana

A county in Montana, ranked 39 of 56 by population.

CountyFIPS 30097

Within Montana
Sweet Grass County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Big Timber, the county seat, located via the 2025 Census Gazetteer.

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Population
3,762
+88 (+2.4%) since 2020
Land area
1,856
square miles. A further 0.4% of the total area is water
Population density
2.0
people per square mile, computed rather than published
County seat
Big Timber
Seat of county government.
Established
1895
130 years ago
Largest city
Big Timber city
Population 1,686.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Sweet Grass County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Sweet Grass County, Montana from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 502 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Sweet Grass County ranks

Position among the 56 counties of Montana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MontanaNationally
Population3,76239th of 562,899th of 3,144
Land area1,856 sq mi37th of 56313th of 3,144
Population density2.0 per sq mi35th of 562,986th of 3,144
Median household income$77,0006th of 56727th of 3,143

Full data for Sweet Grass County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population3,762Vintage 2025 Population Estimates
Population in 20203,674Vintage 2025 Population Estimates
2020 estimates base?3,681Vintage 2025 Population Estimates
Land area1,856 sq mi2025 Gazetteer Files
Water area6.7 sq mi2025 Gazetteer Files
Total area1,862 sq mi2025 Gazetteer Files
Population density?2.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$77,000American Community Survey 2020-2024 5-Year Estimates
Median home value$330,100American Community Survey 2020-2024 5-Year Estimates
Median age47.0American Community Survey 2020-2024 5-Year Estimates
Households1,552American Community Survey 2020-2024 5-Year Estimates
Housing units1,900American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+2
37 births, 35 deaths
Net migration
-57
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Sweet Grass County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Stillwater CountyMontana92 mi9,445
Park CountyMontana82 mi18,214
Wheatland CountyMontana30 mi2,100
Golden Valley CountyMontana23 mi844
Meagher CountyMontana2.5 mi2,137

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 56 counties of Montana

Open the interactive Montana county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.