County Maps US

Prairie County, Montana

A county in Montana, ranked 52 of 56 by population.

CountyFIPS 30079

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

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Population
1,112
+18 (+1.6%) since 2020
Land area
1,737
square miles. A further 0.3% of the total area is water
Population density
0.64
people per square mile, computed rather than published
County seat
Terry
Seat of county government.
Established
1915
110 years ago
Largest city
Terry town
Population 574.

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 Prairie 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 Prairie 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 800 by 537 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 Prairie 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
Population1,11252nd of 563,103rd of 3,144
Land area1,737 sq mi39th of 56343rd of 3,144
Population density0.64 per sq mi52nd of 563,108th of 3,144
Median household income$51,25052nd of 562,704th of 3,143

Full data for Prairie County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population1,112Vintage 2025 Population Estimates
Population in 20201,094Vintage 2025 Population Estimates
2020 estimates base?1,094Vintage 2025 Population Estimates
Land area1,737 sq mi2025 Gazetteer Files
Water area5.8 sq mi2025 Gazetteer Files
Total area1,742 sq mi2025 Gazetteer Files
Population density?0.64 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$51,250American Community Survey 2020-2024 5-Year Estimates
Median home value$165,700American Community Survey 2020-2024 5-Year Estimates
Median age57.8American Community Survey 2020-2024 5-Year Estimates
Households545American Community Survey 2020-2024 5-Year Estimates
Housing units687American 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
-6
7 births, 13 deaths
Net migration
+10
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 6 areas bordering Prairie 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
Custer CountyMontana91 mi12,034
Dawson CountyMontana60 mi8,692
McCone CountyMontana44 mi1,720
Garfield CountyMontana22 mi1,148
Wibaux CountyMontana12 mi885
Fallon CountyMontana11 mi2,959

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.