The value of farms, ranches, hunting land and other land for sale in San Juan County recently on Land.com was almost $47 million. This represents around 5,000 acres of farms, ranches, and rural real estate for sale in San Juan County. San Juan County ranks 20th out of 29 counties in the Beehive State for the combined amount of land currently advertised for sale. Among cities in San Juan County with farms and ranches for sale, Moab had the most land for sale. Economically speaking, San Juan County's is largely dependent on mining and mineral extraction-related businesses and services. San Juan County is the largest county in Utah (7,933 square miles). It's located in the East Utah region of the state.