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Sully County, South Dakota facts for kids

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Sully County
Sully Courthouse (2013)
Sully Courthouse (2013)
Map of South Dakota highlighting Sully County
Location within the U.S. state of South Dakota
Map of the United States highlighting South Dakota
South Dakota's location within the U.S.
Country  United States
State  South Dakota
Founded 1873 (created)
1883 (organized)
Named for Alfred Sully
Seat Onida
Largest city Onida
Area
 • Total 1,070 sq mi (2,800 km2)
 • Land 1,007 sq mi (2,610 km2)
 • Water 63 sq mi (160 km2)  5.9%
Population
 (2020)
 • Total 1,446
 • Estimate 
(2021)
1,476 Increase
 • Density 1.351/sq mi (0.5218/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional district At-large

Sully County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,446, making it the fifth-least populous county in South Dakota. Its county seat is Onida. The county was created in 1873 and organized in 1883. It is named after General Alfred Sully, who built Fort Sully.

Sully County is included in the Pierre, SD Micropolitan Statistical Area.

Geography

According to the U.S. Census Bureau, the county has a total area of 1,070 square miles (2,800 km2), of which 1,007 square miles (2,610 km2) is land and 63 square miles (160 km2) (5.9%) is water.

Major highways

Adjacent counties

Demographics

Historical population
Census Pop.
1880 296
1890 2,412 714.9%
1900 1,715 −28.9%
1910 2,462 43.6%
1920 2,831 15.0%
1930 3,852 36.1%
1940 2,668 −30.7%
1950 2,713 1.7%
1960 2,607 −3.9%
1970 2,362 −9.4%
1980 1,990 −15.7%
1990 1,589 −20.2%
2000 1,556 −2.1%
2010 1,373 −11.8%
2020 1,446 5.3%
2021 (est.) 1,476 7.5%
US Decennial Census
1790–1960 1900–1990
1990–2000 2010–2020

2010 census

As of the 2010 United States Census, there were 1,373 people, 610 households, and 397 families in the county. The population density was 1.4 inhabitants per square mile (0.54/km2). There were 845 housing units at an average density of 0.84 per square mile (0.32/km2). The racial makeup of the county was 96.6% white, 1.2% American Indian, 0.1% black or African American, 0.0% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 0.9% of the population. In terms of ancestry,

Of the 610 households, 27.0% had children under the age of 18 living with them, 57.5% were married couples living together, 4.6% had a female householder with no husband present, 34.9% were non-families, and 31.6% of all households were made up of individuals. The average household size was 2.25 and the average family size was 2.82. The median age was 46.6 years.

The median income for a household in the county was $48,958 and the median income for a family was $58,875. Males had a median income of $34,375 versus $29,087 for females. The per capita income for the county was $26,596. About 4.4% of families and 8.0% of the population were below the poverty line, including 12.8% of those under age 18 and 8.4% of those age 65 or over.

Communities

City

Town

Census-designated place

Unorganized territories

The county is divided into two areas of unorganized territory: West Sully and East Sully.

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