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San Juan County, NM

San Juan County, New Mexico
San Juan County New Mexico Administration Building.jpg
San Juan County Administration Building in Aztec
Seal of San Juan County, New Mexico
Seal
Map of New Mexico highlighting San Juan County
Location in the U.S. state of New Mexico
Map of the United States highlighting New Mexico
New Mexico's location in the U.S.
Founded February 24, 1887
Seat Aztec
Largest city Farmington
Area
 • Total 5,538 sq mi (14,343 km2)
 • Land 5,513 sq mi (14,279 km2)
 • Water 25 sq mi (65 km2), 0.5%
Population (est.)
 • (2015) 118,737
 • Density 24/sq mi (9/km²)
Congressional district 3rd
Time zone Mountain: UTC-7/-6
Website www.sjcounty.net

San Juan County is a county in the U.S. state of New Mexico. As of 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 in the state's northwest corner and includes the New Mexico portion of the Four Corners.

According to the U.S. 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.

San Juan County in New Mexico and Utah are two of twenty-two counties or parishes in the United States with the same name to border each other across state lines. The others are Union Parish, Louisiana and Union County, Arkansas, Big Horn County, Montana and Big Horn County, Wyoming, Sabine County, Texas and Sabine Parish, Louisiana, Bristol County, Massachusetts and Bristol County, Rhode Island, Kent County, Delaware and Kent County, Maryland, Escambia County, Alabama and Escambia County, Florida., Pike County, Illinois and Pike County, Missouri, Teton County, Idaho and Teton County, Wyoming, Park County, Montana and Park County, Wyoming, and Vermilion County, Illinois and Vermillion County, Indiana. respectively. (Note, despite the different spellings, the source of the name is the same for Vermilion County, Illinois and Vermillion County, Indiana—the Vermillion River which flows through both counties.)


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