Union County, South Dakota, United States
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- Union County
- County
- Located in southeastern South Dakota, between the Big Sioux River and the Missouri River, 24 km (15 mi) northwest of Sioux City, Iowa; County Seat: Elk Point.
- Created and organized in 1862; originally named Cole County for Austin Cole, a member of the 1st Territorial Legislature. In 1864, the County boundaries and name were changed expressing support for the Union during the Civil War. (SD-T/p35)
- 42.816662242° 48' 60.0"N-96.694760096° 41' 41.1"W
- 10,189
- 358 m
- 791800913
- Updated May 7, 2020