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Dewey County, South Dakota
Map of South Dakota highlighting Dewey County
Location in the state of South Dakota
Map of USA SD
South Dakota's location in the U.S.
Founded 1883
Named for William P. Dewey
Seat Timber Lake
 - Total
 - Land
 - Water

2,446 sq mi (6,334 km²)
2,303 sq mi (5,964 km²)
143 sq mi (370 km²), 2.07%
 - (2010)
 - Density

3/sq mi (1/km²)

Dewey County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 5,301.[1] It's county seat is Timber Lake.[2] It was created in 1883 and was named for William P. Dewey, Territorial surveyor-general from 1873 to 1877.


According to the U.S. Census Bureau, the county has a total area of 2,446 square miles (6,335.1 km2), of which 2,303 square miles (5,964.7 km2) is land and 143 square miles (370.4 km2) (5.85%) is water. Almost the entire county lies in the Cheyenne River Indian Reservation. The balance of the county, along its extreme northern county line, lies in the Standing Rock Indian Reservation. It is one of five South Dakota counties that lie entirely on Indian reservations.


The county is divided into two areas of unorganized territory: North Dewey and South Dewey.

Major highwaysEdit

Adjacent countiesEdit


Historical population
Year Pop. ±%
1880 46
1910 1,145 +2389.1%
1920 4,802 +319.4%
1930 6,476 +34.9%
1940 5,709 −11.8%
1950 4,916 −13.9%
1960 5,257 +6.9%
1970 5,170 −1.7%
1980 5,366 +3.8%
1990 5,523 +2.9%
2000 5,972 +8.1%
2010 5,301 −11.2%
U.S. Decennial Census

As of the census[3] of 2000, there were 5,972 people, 1,863 households, and 1,386 families residing in the county. The population density was 3 people per square mile (1/km²). There were 2,133 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 74.16% Native American, 24.15% White, 0.03% Black or African American, 0.12% Asian, 0.05% Pacific Islander, 0.07% from other races, and 1.42% from two or more races. 0.85% of the population were Hispanic or Latino of any race. 14.2% were of German ancestry according to Census 2000. 84.6% spoke English and 14.4% Dakota as their first language.

There were 1,863 households out of which 43.70% had children under the age of 18 living with them, 42.90% were married couples living together, 22.30% had a female householder with no husband present, and 25.60% were non-families. 22.10% of all households were made up of individuals and 8.90% had someone living alone who was 65 years of age or older. The average household size was 3.15 and the average family size was 3.66.

In the county, the population was spread out with 38.90% under the age of 18, 9.00% from 18 to 24, 27.20% from 25 to 44, 16.60% from 45 to 64, and 8.30% who were 65 years of age or older. The median age was 26 years. For every 100 females there were 95.90 males. For every 100 females age 18 and over, there were 95.00 males.

The median income for a household in the county was $23,272, and the median income for a family was $24,917. Males had a median income of $21,522 versus $18,777 for females. The per capita income for the county was $9,251. About 29.80% of families and 33.60% of the population were below the poverty line, including 37.70% of those under age 18 and 28.50% of those age 65 or over. The county's per-capita income makes it one of the poorest counties in the United States.

Cities and townsEdit

2010 United States Census population[4]

See alsoEdit


  1. ^ United States Census Bureau. "2010 Census Data". United States Census Bureau. Retrieved 4 August 2011. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 
  4. ^ "Incorporated Places and Minor Civil Divisions: South Dakota". Population Census. 2010 United States Census. 2011-07-18. Retrieved 2011-08-04. 

Coordinates: 45°10′N 100°53′W / 45.16, -100.88

This page uses content from the English language Wikipedia. The original content was at Dewey County, South Dakota. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.

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