County Maps US

Crook County, Wyoming

A county in Wyoming, ranked 19 of 23 by population.

CountyFIPS 56011

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

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Population
7,852
+669 (+9.3%) since 2020
Land area
2,854
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
Sundance
Seat of county government.
Established
1875
150 years ago
Largest city
Sundance town
Population 1,141.

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 Crook 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 Crook 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 722 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 Crook 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
Population7,85219th of 232,585th of 3,144
Land area2,854 sq mi14th of 23183rd of 3,144
Population density2.8 per sq mi18th of 232,925th of 3,144
Median household income$79,6379th of 23601st of 3,143

Full data for Crook County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population7,852Vintage 2025 Population Estimates
Population in 20207,183Vintage 2025 Population Estimates
2020 estimates base?7,182Vintage 2025 Population Estimates
Land area2,854 sq mi2025 Gazetteer Files
Water area10.9 sq mi2025 Gazetteer Files
Total area2,865 sq mi2025 Gazetteer Files
Population density?2.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$79,637American Community Survey 2020-2024 5-Year Estimates
Median home value$285,800American Community Survey 2020-2024 5-Year Estimates
Median age44.1American Community Survey 2020-2024 5-Year Estimates
Households2,907American Community Survey 2020-2024 5-Year Estimates
Housing units3,685American 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
+18
86 births, 68 deaths
Net migration
+44
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 Crook 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
Campbell CountyWyoming58 mi48,145
Weston CountyWyoming51 mi6,840
Carter CountyMontana48 mi1,383
Butte CountySouth Dakota29 mi10,856
Lawrence CountySouth Dakota27 mi29,459
Powder River CountyMontana1.9 mi1,781

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.