A total of almost 1,000 acres were listed for sale in Union County, Pennsylvania, recently, representing a combined nearly $11 million in Union County farms and rural land for sale. Union County ranks 61st out of 67 counties in the state for the total acreage of land currently advertised for sale. Of all locations in Union County with land for sale, Lewisburg featured the most land for sale. Government and state-level services are the main economic drivers in Union County. Union County is Pennsylvania's 64th largest county (317 square miles). It's located in the Alleghenies & Valleys Pennsylvania region of Pennsylvania.