County Maps US

Beaverhead County, Montana

The largest of Montana's 56 counties by land area.

CountyFIPS 30001

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

Download SVGFull Montana map downloads

Population
10,043
+668 (+7.1%) since 2020
Land area
5,543
square miles. A further 0.5% of the total area is water
Population density
1.8
people per square mile, computed rather than published
County seat
Dillon
Seat of county government.
Established
1865
160 years ago
Largest city
Dillon city
Population 4,271.

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 Beaverhead 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 Beaverhead 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 734 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 Beaverhead 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
Population10,04322nd of 562,402nd of 3,144
Land area5,543 sq mi1st of 5665th of 3,144
Population density1.8 per sq mi37th of 563,004th of 3,144
Median household income$61,26834th of 561,957th of 3,143

Full data for Beaverhead County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population10,043Vintage 2025 Population Estimates
Population in 20209,375Vintage 2025 Population Estimates
2020 estimates base?9,368Vintage 2025 Population Estimates
Land area5,543 sq mi2025 Gazetteer Files
Water area30.2 sq mi2025 Gazetteer Files
Total area5,573 sq mi2025 Gazetteer Files
Population density?1.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,268American Community Survey 2020-2024 5-Year Estimates
Median home value$308,300American Community Survey 2020-2024 5-Year Estimates
Median age43.2American Community Survey 2020-2024 5-Year Estimates
Households4,201American Community Survey 2020-2024 5-Year Estimates
Housing units4,981American 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
-21
96 births, 117 deaths
Net migration
+74
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 7 areas bordering Beaverhead 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
Lemhi CountyIdaho158 mi8,474
Madison CountyMontana123 mi10,026
Clark CountyIdaho95 mi783
Deer Lodge CountyMontana43 mi9,709
Ravalli CountyMontana39 mi48,582
Silver Bow CountyMontana35 mi36,118
Fremont CountyIdaho30 mi14,208

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.