San Juan County 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.
San Juan County Courthouse, Monticello
Ruins in Montezuma Canyon with stones of unusual size
House on Fire ruin, one of many Ancestral Pueblo ruins in the county
The border between San Juan (right) and Kane (left) counties along Lake Powell, taken July 4, 2022, from the International Space Station
Monticello is a city located in San Juan County, Utah, United States and is the county seat. It is the second most populous city in San Juan County, with a population of 1,972 at the 2010 census. The Monticello area was settled in July 1887 by pioneers from the Church of Jesus Christ of Latter-day Saints. Monticello, named in honor of Thomas Jefferson's estate, became the county seat in 1895 and was incorporated as a city in 1910.
San Juan County Courthouse
Monticello Utah Temple