Crook County, Wyoming

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Crook County, Wyoming
Map of Wyoming highlighting Crook County
Location in the state of Wyoming
Map of the United States highlighting Wyoming
Wyoming's location in the U.S.
Founded 1875
Named for George Crook
Seat Sundance
Largest town Sundance
 • Total 2,865 sq mi (7,420 km2)
 • Land 2,855 sq mi (7,394 km2)
 • Water 11 sq mi (28 km2), 0.4%
 • (2010) 7,083
 • Density 2.5/sq mi (1/km²)
Congressional district At-large
Time zone Mountain: UTC-7/-6
Buffalo on the range in Crook County, Wyoming

Crook County is a county located in the northeastern section of the U.S. state of Wyoming. As of the 2010 census, the population was 7,083,[1] making it the third-least populous county in Wyoming. Its county seat is Sundance.[2]


Crook County was created by on the legislature of the Wyoming Territory on December 8, 1868, from portions of Albany and Laramie Counties.[3]

Crook County was named for Brigadier General George Crook, a commander during the Indian Wars.[4] In 1890, Crook County lost territory when Weston County was created. Campbell County was formed with land ceded by Crook County in 1911.


According to the U.S. Census Bureau, the county has a total area of 2,865 square miles (7,420 km2), of which 2,855 square miles (7,390 km2) is land and 11 square miles (28 km2) (0.4%) is water.[5] The lowest point in the state of Wyoming is located on the Belle Fourche River in Crook County, where it flows out of Wyoming and into South Dakota.

Devils Tower National Monument is located in the Bear Lodge Mountains in Crook County.

Major highways[edit]

Adjacent counties[edit]

National protected areas[edit]


Historical population
Census Pop.
1880 239
1890 2,338 878.2%
1900 3,137 34.2%
1910 6,492 106.9%
1920 5,524 −14.9%
1930 5,333 −3.5%
1940 5,463 2.4%
1950 4,738 −13.3%
1960 4,691 −1.0%
1970 4,535 −3.3%
1980 5,308 17.0%
1990 5,294 −0.3%
2000 5,887 11.2%
2010 7,083 20.3%
Est. 2014 7,248 2.3%
U.S. Decennial Census[6]
1870-2000[7] 2010-2012[1]

As of the census[8] of 2000, there were 5,887 people, 2,308 households, and 1,645 families residing in the county. The population density was 2 people per square mile (1/km²). There were 2,935 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 97.86% White, 0.05% Black or African American, 1.02% Native American, 0.07% Asian, 0.25% from other races, and 0.75% from two or more races. 0.92% of the population were Hispanic or Latino of any race. 34.1% were of German, 14.6% English, 7.8% Irish and 6.8% American ancestry according to Census 2000.

There were 2,308 households out of which 32.30% had children under the age of 18 living with them, 62.30% were married couples living together, 5.40% had a female householder with no husband present, and 28.70% were non-families. 24.90% of all households were made up of individuals and 10.30% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.01.

In the county the population was spread out with 26.90% under the age of 18, 6.60% from 18 to 24, 24.60% from 25 to 44, 27.20% from 45 to 64, and 14.70% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 102.40 males. For every 100 females age 18 and over, there were 101.80 males.

The median income for a household in the county was $35,601, and the median income for a family was $43,105. Males had a median income of $34,483 versus $18,967 for females, indicating a relatively high level of income inequality based on gender. The per capita income for the county was $17,379. About 7.8% of families and 9.10% of the population were below the poverty line, including 9.90% of those under age 18 and 11.80% of those age 65 or over.


Crook County is one of the most heavily Republican counties in the state, both in state and federal elections. The last Democratic candidate to carry the county was Franklin D. Roosevelt in 1932.[9] In the last five Presidential elections the Democratic candidate has consistently received less than 24% of the county's vote.[10]

In the Wyoming Senate the county is represented by Republican Ogden Driskill since 2011.[11] In the Wyoming House of Representatives it has been represented by Republican Mark Semlek since 2003.[12]



Census-designated place[edit]

Other communities[edit]

Free State Wyoming[edit]

Crook County is one of the counties that Free State Wyoming encourages people moving to Wyoming to move to.

See also[edit]


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved January 25, 2014. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ Long, John H. (2006). "Wyoming: Individual County Chronologies". Wyoming Atlas of Historical County Boundaries. The Newberry Library. Retrieved 2011-09-06. 
  4. ^ Urbanek, Mae (1988). Wyoming Place Names. Missoula, MT: Mountain Press Publishing Company. ISBN 0-87842-204-8. 
  5. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23. 
  6. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved January 25, 2014. 
  7. ^ "Historical Decennial Census Population for Wyoming Counties, Cities, and Towns". Wyoming Department of Administration & Information, Division of Economic Analysis. Retrieved January 25, 2014. 
  8. ^ "American FactFinder". United States Census Bureau. Retrieved 2011-05-14. 
  9. ^ Geographie Electorale
  10. ^ The New York Times electoral map (Zoom in on Wyoming)
  11. ^ Wyoming State Legislature Profile for Charles Townsend
  12. ^ Wyoming State Legislature Profile for Mark Semlek

Coordinates: 44°35′N 104°34′W / 44.59°N 104.56°W / 44.59; -104.56