Union County is in Southeast South Dakota. Of the 66 counties in the Coyote State, Union County ranks 62nd in terms of size (467 square miles). Union County, South Dakota, has approximately 1,000 acres of undeveloped land for sale based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here was nearly $5 million. The average price of undeveloped land for sale in Union County was $899,075. Some suggested uses for undeveloped land currently for sale in Union County include for hunting/fishing, commercial, and residential single use. Some common wildlife species to be found on undeveloped land for sale in Union County include whitetail deer, mule deer, turkey, deer and grouse. Current commercial applications for commercial property for sale in Union County include for hunting/fishing, commercial and residential single use. Browse all South Dakota undeveloped land for sale on the Land Network to find your next commercial property or land investment.