There was a combined approximately $70 million of farms, hunting land and other rural land and acreage for sale in Franklin County, Pennsylvania, recently on Land.com. The total size of all Franklin County farms and rural land for sale was approximately 2,000 acres. Franklin County ranks 29th in the Keystone State for the combined amount of land currently advertised for sale. Of all locations in Franklin County with land for sale, Greencastle had the most land for sale. Franklin County is the 27th largest county (772 square miles) in Pennsylvania. It's located in the Dutch Country Roads Pennsylvania region of Pennsylvania.