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Yankton County is a county located in the state of South Dakota. Based on the 2010 census, the population was 22,438. Its county seat is
Yankton County comprises the Yankton, SD Micropolitan Statistical Area.
Yankton is named for the Yankton Sioux Native American people.
County QuickFacts: CensusBureau Quick Facts
Yankton County was named for the Yankton tribe of Sioux Indians who lived in this region at the time settlement was begun in 1858. The first legislature for Dakota Territory convened under the Governor's call at Yankton, March 17, 1862. At this session Yankton was made the permanent capital of the Territory and a bill was passed establishing Yankton County.
As reported by the Census Bureau, the county has a total area of 533 square miles (1,379 km2), of which, 522
square miles (1,351 km2) of it is land and 11 square miles (29 km2) of it (2.08%) is water. It is bordered by the
Bordering counties are as follows: