Land for sale in Franklin County, Idaho, recently totaled approximately $59 million and 5,000 acres. Franklin County ranks 25th out of 44 counties in the Gem State for the total number of acres of land currently advertised for sale. Among cities in Franklin County with ranches, farms, hunting land and other rural land and acreage for sale, Preston featured the most land for sale. Its economy is defined as agricultural, with 834 farms recorded in the county during the most recent U.S. Census. Farming activities in Franklin County generate annual revenues of $2 million, the majority of which comes from livestock products. Franklin County is the 37th biggest county (667 square miles) in Idaho. It's located in the Southeastern Idaho region of the state.