Of 82 counties in the Magnolia State, Union County ranks 72nd in terms of size (416 square miles). Union County is in Hills Mississippi. A recent survey of Land Network data shows roughly 1,000 acres of ranches for sale in Mississippi's Union County, which is valued at a combined $2 million. Browse all Union County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Union County is residential property.