The value of all ranches, farms, hunting land and other rural land and acreage for sale in San Juan County recently was around $212 million, representing a combined 7,755 acres of land for sale in San Juan County. San Juan County ranks seventh in the Land of Enchantment for the total acreage of land currently advertised for sale. Of all land for sale in San Juan County, Farmington featured 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 one of the ten biggest counties in New Mexico (5,538 square miles). It's located in the Northwest New Mexico region of the state.