County Maps US

Big Horn County, Wyoming

A county in Wyoming, ranked 15 of 23 by population.

CountyFIPS 56003

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

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Population
12,024
+544 (+4.7%) since 2020
Land area
3,137
square miles. A further 0.7% of the total area is water
Population density
3.8
people per square mile, computed rather than published
County seat
Basin
Seat of county government.
Established
1897
128 years ago
Largest city
Lovell town
Population 2,351.

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 Big Horn 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 Big Horn County, Wyoming 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 653 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 Big Horn County ranks

Position among the 23 counties of Wyoming, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn WyomingNationally
Population12,02415th of 232,279th of 3,144
Land area3,137 sq mi13th of 23165th of 3,144
Population density3.8 per sq mi14th of 232,839th of 3,144
Median household income$62,10120th of 231,890th of 3,143

Full data for Big Horn County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population12,024Vintage 2025 Population Estimates
Population in 202011,480Vintage 2025 Population Estimates
2020 estimates base?11,519Vintage 2025 Population Estimates
Land area3,137 sq mi2025 Gazetteer Files
Water area21.3 sq mi2025 Gazetteer Files
Total area3,158 sq mi2025 Gazetteer Files
Population density?3.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$62,101American Community Survey 2020-2024 5-Year Estimates
Median home value$216,500American Community Survey 2020-2024 5-Year Estimates
Median age41.7American Community Survey 2020-2024 5-Year Estimates
Households4,460American Community Survey 2020-2024 5-Year Estimates
Housing units5,372American 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
-23
112 births, 135 deaths
Net migration
+33
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 Big Horn 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
Washakie CountyWyoming70 mi7,597
Park CountyWyoming61 mi31,171
Sheridan CountyWyoming60 mi33,241
Johnson CountyWyoming43 mi8,908
Carbon CountyMontana18 mi11,466
Big Horn CountyMontana17 mi12,752

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 23 counties of Wyoming

Open the interactive Wyoming county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.