County Maps US

Madison County, Montana

A county in Montana, ranked 23 of 56 by population.

CountyFIPS 30057

Within Montana
Madison County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data.

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Population
10,026
+1,369 (+15.8%) since 2020
Land area
3,588
square miles. A further 0.4% of the total area is water
Population density
2.8
people per square mile, computed rather than published
County seat
Virginia City
Seat of county government.
Established
1865
160 years ago
Largest city
Ennis town
Population 1,126.

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 Madison 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 Madison 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 677 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 Madison 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
Population10,02623rd of 562,404th of 3,144
Land area3,588 sq mi13th of 56140th of 3,144
Population density2.8 per sq mi29th of 562,920th of 3,144
Median household income$75,25010th of 56828th of 3,143

Full data for Madison County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population10,026Vintage 2025 Population Estimates
Population in 20208,657Vintage 2025 Population Estimates
2020 estimates base?8,622Vintage 2025 Population Estimates
Land area3,588 sq mi2025 Gazetteer Files
Water area15.4 sq mi2025 Gazetteer Files
Total area3,604 sq mi2025 Gazetteer Files
Population density?2.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$75,250American Community Survey 2020-2024 5-Year Estimates
Median home value$470,100American Community Survey 2020-2024 5-Year Estimates
Median age52.2American Community Survey 2020-2024 5-Year Estimates
Households3,740American Community Survey 2020-2024 5-Year Estimates
Housing units6,396American 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
-24
72 births, 96 deaths
Net migration
+284
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 Madison 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
Beaverhead CountyMontana123 mi10,043
Gallatin CountyMontana96 mi128,740
Jefferson CountyMontana33 mi13,329
Silver Bow CountyMontana30 mi36,118
Fremont CountyIdaho8.1 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.