Union County is a county located in the state of South Dakota. Based on the 2010 census, the population was 14,399. Its county seat is Elk
Point. Originally named Cole County, the named was changed to Union because of Civil War sentiment.
Union County is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area
Etymology - Origin of Union County Name
Union was named because of pro-Union sentiment during the American Civil War.
Union County, created in 1862, organized in 1862, was originally named Cole for Austin Cole, a member of the first
Territorial Legislature. Two years later, in 1864, the boundaries were rearranged and the name was changed to Union
because of sentiment for the Union side of the Civil War. The county seat is located at Elk Point.
Geography: Land and Water
As reported by the Census Bureau, the county has a total area of 467 square miles (1,210 km2), of which, 460
square miles (1,192 km2) of it is land and 7 square miles (17 km2) of it (1.43%) is water.