There was a combined almost $48 million of ranches, farms, hunting land and other rural land and acreage for sale in San Juan County recently on Land.com. The total of all San Juan County ranches, farms, hunting land and other rural land and acreage for sale was nearly 5,000 acres. San Juan County ranks 20th in Utah for the combined amount of land currently advertised for sale. Moab had the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Utah. San Juan County is the largest county in Utah (7,933 square miles). It's located in the East Utah region of the state.