County Maps US

Stillwater County, Montana

A county in Montana, ranked 25 of 56 by population.

CountyFIPS 30095

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

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Population
9,445
+447 (+5.0%) since 2020
Land area
1,797
square miles. A further 0.5% of the total area is water
Population density
5.3
people per square mile, computed rather than published
County seat
Columbus
Seat of county government.
Established
1913
112 years ago
Largest city
Columbus town
Population 1,964.

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 Stillwater 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 Stillwater 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 718 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 Stillwater 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
Population9,44525th of 562,451st of 3,144
Land area1,797 sq mi38th of 56329th of 3,144
Population density5.3 per sq mi18th of 562,758th of 3,144
Median household income$84,7323rd of 56431st of 3,143

Full data for Stillwater County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population9,445Vintage 2025 Population Estimates
Population in 20208,998Vintage 2025 Population Estimates
2020 estimates base?8,960Vintage 2025 Population Estimates
Land area1,797 sq mi2025 Gazetteer Files
Water area9.2 sq mi2025 Gazetteer Files
Total area1,806 sq mi2025 Gazetteer Files
Population density?5.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$84,732American Community Survey 2020-2024 5-Year Estimates
Median home value$405,800American Community Survey 2020-2024 5-Year Estimates
Median age46.7American Community Survey 2020-2024 5-Year Estimates
Households3,810American Community Survey 2020-2024 5-Year Estimates
Housing units4,657American 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
-4
83 births, 87 deaths
Net migration
+21
More people moved in than moved out.

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

The 5 areas bordering Stillwater 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
Sweet Grass CountyMontana92 mi3,762
Carbon CountyMontana77 mi11,466
Yellowstone CountyMontana40 mi172,692
Golden Valley CountyMontana30 mi844
Park CountyMontana13 mi18,214

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.