Union County is in Southeast South Dakota. Of the 66 counties in the state, Union County is 62nd in terms of its size (298,961 acres). Recent listings of farms for sale in South Dakota's Union County totals 1,000 acres and a combined market value of almost $5 million. By overall acreage, residential property is the most common type of land for sale in Union County. The average price of farmland for sale in Union County was $1 million. Farms for sale in Union County hold livestock including cattle, horses, goats and sheep. Browse all South Dakota farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs.