Of 66 counties in the Coyote State, Union County is 62nd in terms of its size (467 square miles). Union County is in Southeast South Dakota. Recent Land Network data totals roughly 1,000 acres of hunting land for sale in South Dakota's Union County, which is valued at a combined $8 million. Browse all Union County hunting land for sale on the Land Network to find the hunting tract that suits your hunting and outdoor-recreation interests, whether you're an individual looking to invest in hunting land for future use or commercial operation looking for land on which to expand your commercial hunting operation. The most common type of land for sale by combined acreage in Union County is homesite.