Sully County, South Dakota

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SULLY_COUNTY_COURTHOUSE,_ONIDA,_SD
Sully County
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.
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Country United States


State South Dakota
Founded1873
SeatOnida
Area
 • Total1,070 sq mi (2,800 km2)
 • Land1,007 sq mi (2,610 km2)
 • Water63 sq mi (160 km2)
Population
 (2020)
 • Total1,373
 • Density1.4/sq mi (0.5/km2)


Sully County is a county located in the state of South Dakota, United States. As of the 2020 census, the population was 1,373. The county seat and largest city is Onida.

History[edit | edit source]

Sully County was created in 1873 and organized in 1883. It was named for General Alfred Sully, a military officer during the American Civil War and the Indian Wars.

Geography[edit | edit source]

According to the United States 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.

Adjacent counties[edit | edit source]

Major highways[edit | edit source]

Demographics[edit | edit source]

As of the 2020 census, there were 1,373 people, 607 households, and 402 families residing in the county. The population density was 1.4 inhabitants per square mile (0.54/km²). The racial makeup of the county was predominantly White, with small percentages of other races.

Communities[edit | edit source]

City[edit | edit source]

Town[edit | edit source]

Unincorporated communities[edit | edit source]

Government and politics[edit | edit source]

Sully County is governed by a board of county commissioners. The county is part of South Dakota's at-large congressional district.

Education[edit | edit source]

The county is served by the Onida School District and the Agar-Blunt-Onida School District.

Economy[edit | edit source]

The economy of Sully County is primarily based on agriculture, with significant contributions from livestock and crop farming.

See also[edit | edit source]

References[edit | edit source]

External links[edit | edit source]

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Contributors: Prab R. Tumpati, MD