Yankton County, established in 1862, is located along the southern border of South Dakota along the Missouri River. The county encompasses a total area of 533 square miles with a population of 21,835 (2008 US Census estimate).
The primary industries in the county are agriculture, manufacturing, and services.
The county seat is located in the largest city in the county - Yankton (population 13,528).
The county commission board is comprised of 5 members.
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