Union County is in Southeast South Dakota. Of the 66 counties in the Mount Rushmore State, Union County ranks 62nd in terms of size (467 square miles). Recent Land Network data includes nearly 1,000 acres of undeveloped land for sale in South Dakota's Union County, which is valued at a combined $2 million. The average price of undeveloped land for sale in Union County was $750,001. Some suggested uses for undeveloped land currently for sale in Union County include for hunting/fishing, commercial, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Union County include whitetail deer, mule deer, turkey, pheasant and deer. Current commercial applications for commercial property for sale in Union County include for hunting/fishing, commercial and agriculture use. Browse all South Dakota undeveloped land for sale on the Land Network to find your next commercial property or land investment.