Union County is in Southeast South Dakota. Of the 66 counties in the Coyote State, Union County ranks 62nd in terms of size (298,961 acres). Recent listings of farms for sale in South Dakota's Union County totals almost 1,000 acres and a combined market value of nearly $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 support livestock including cattle, horses and goats. 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.