Union County, County in southeastern South Dakota, United States.
Union County occupies the southeastern corner of South Dakota, with the Big Sioux River forming its eastern border and the Missouri River marking its southwestern boundary.
The territory was established in 1862 as Cole County, but changed its name to Union County in 1864 to demonstrate support during the Civil War period.
The county maintains strong agricultural traditions through its rolling hills and fertile lands, supporting grain production and livestock farming across multiple generations of families.
Interstate 29 runs north to south through Union County, connecting residents to major economic centers while facilitating transportation of agricultural and commercial products.
The county seat transferred from Richland to Elk Point in 1865, making Elk Point one of the earliest established administrative centers in southeastern South Dakota.
Location: South Dakota
Inception: 1862
Capital city: Elk Point
Shares border with: Clay County, Dakota County, Dixon County, Lincoln County, Plymouth County, Sioux County, Woodbury County
Website: http://unioncountysd.org
GPS coordinates: 42.83000,-96.65000
Latest update: April 27, 2025 23:30
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Spirit Mound Historic Prairie
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34.7 km
Great Northern Railway 1355
36.4 km
Peirce Mansion
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Theophile Bruguier Cabin
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Charles M. and Emma M. Fischer Fleshman House
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First National Bank Building of Vermillion
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Adams Homestead and Nature Preserve
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Linden House
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Forest Avenue Historic District
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