County Maps US

Carbon County, Montana

A county in Montana, ranked 19 of 56 by population.

CountyFIPS 30009

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

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Population
11,466
+955 (+9.1%) since 2020
Land area
2,048
square miles. A further 0.7% of the total area is water
Population density
5.6
people per square mile, computed rather than published
County seat
Red Lodge
Seat of county government.
Established
1895
130 years ago
Largest city
Red Lodge city
Population 2,723.

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 Carbon 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 Carbon 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 467 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 Carbon 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
Population11,46619th of 562,320th of 3,144
Land area2,048 sq mi33rd of 56277th of 3,144
Population density5.6 per sq mi15th of 562,741st of 3,144
Median household income$80,2614th of 56576th of 3,143

Full data for Carbon County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population11,466Vintage 2025 Population Estimates
Population in 202010,511Vintage 2025 Population Estimates
2020 estimates base?10,476Vintage 2025 Population Estimates
Land area2,048 sq mi2025 Gazetteer Files
Water area13.5 sq mi2025 Gazetteer Files
Total area2,061 sq mi2025 Gazetteer Files
Population density?5.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$80,261American Community Survey 2020-2024 5-Year Estimates
Median home value$420,800American Community Survey 2020-2024 5-Year Estimates
Median age50.4American Community Survey 2020-2024 5-Year Estimates
Households4,664American Community Survey 2020-2024 5-Year Estimates
Housing units6,455American 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
+16
113 births, 97 deaths
Net migration
-53
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 6 areas bordering Carbon 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 CountyMontana77 mi9,445
Big Horn CountyMontana77 mi12,752
Park CountyWyoming58 mi31,171
Yellowstone CountyMontana25 mi172,692
Big Horn CountyWyoming18 mi12,024
Park CountyMontana11 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.