San Juan County (/sæn ˈwɑːn/ san-WAHN) is a county in the southeastern portion of the U.S. state of Utah. As of the 2020 United States Census, the population was 14,518. Its county seat is Monticello, while its most populous city is Blanding. The Utah State Legislature named the county for the San Juan River, itself named by Spanish explorers (in honor of Saint John).
