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San Juan County is a county located in the state of New Mexico. Based on the 2010 census, the population was 130,044, making it the
fifth-most populous county in New Mexico. Its county seat is Aztec. The county was created in 1887.
San Juan County is part of the Farmington, NM Metropolitan Statistical Area. It is located in the northwest corner of the state and includes the New Mexico portion of the Four Corners.
It was named for the San Juan River which begins in the San Juan Mountains
County QuickFacts: CensusBureau Quick Facts
San Juan County was created 24 January 1887. It was named for the San Juan River which begins in the San Juan Mountains. This is the ancient home of the Anasazi. Aztec is the county seat. This county is awash with ancient history, from Aztec Ruins National Monument to Chaco Canyon National Historical Park and the Navajo Nation. This area is rich in agriculture, clean air, open skies, and natural resources.
As reported by the Census Bureau, the county has a total area of 5,538 square miles (14,340 km2), of which 5,513 square miles (14,280
km2) is land and 25 square miles (65 km2) (0.5%) is water.
Indian reservations (and off-reservation trust lands) comprise 63.4 percent of the county's land area: The Navajo Indian Reservation takes up 60.45% and the Ute Mountain Ute Tribe Reservation another 2.93%.
The physical features include three rivers: the San Juan, Animas, and La Plata rivers; also, the Chuska Mountains and Shiprock Pinnacle to the west, volcanic structures, buttes, mesas, badlands, and fertile river valleys.
Bordering counties are as follows: