There was a combined around $10 million of farms and rural land for sale in Union County, Pennsylvania, recently on Land.com. The total acreage of all Union County farms, hunting land and other rural land and acreage for sale was nearly 1,000 acres. Union County ranks 59th in Pennsylvania for the combined amount of land currently advertised for sale. Of all farms, rural land, hunting land and other land for sale in Union County, Lewisburg had the most land for sale. From an economic perspective, government and state-level services contribute most to Union County's overall GDP. Union County is Pennsylvania's 64th biggest county (317 square miles). It's located in the Alleghenies & Valleys Pennsylvania region of the state.