The San Juan River is a 383 mile long major tributary of the Colorado River and a primary drainage for the Four Corners.
The La Plata Mountains, seen from San Juan County, are a small subrange of the San Juan Mountains in sw Colorado, and includes Hesperus Mountain at 13,332 feet.
Angel Peak Scenic Area is located 15 miles south of Bloomfield in San Juan County, with over 10,000 acres of rugged terrain, badlands and deep canyons.
The Aztec Ruins National Monument, on 318 acres, consists of dwellings and sacred structures built by Ancient Pueblo Indians in the 12th and 13th Centuries.
Bisti/De-Na-Zin Wilderness (Bisti Badlands) is a 45,000-acre wilderness area full of rock formations made of sandstone, shale, mudstone, and silt.
Navajo Lake is a 3800 feet long and 400 feet deep reservoir located in northeastern San Juan County, created from a dam completed in 1962.
Shiprock (Tsé Bitʼaʼí, "rock with wings") is a 27 million year old volcanic rock formation, designated as a National Natural Landmark, rising 1,583 feet above the desert.
The eggs and hoodoos in the Bisti Wilderness were formed in sand and silt revealed 73 million years ago when the Western Interior Seaway receded.


San Juan County's estimated population in 2022 is 120,418, similar to what it was in 2004, prior to a peak in 2010.
2022 Estimated Population
2010 Census
2020 Census

Population Change

San Juan County experienced steady population growth through 2010, when it reached just over 130,000 residents. Since 2010, there has been a steady decrease.
Population Estimates retrieved from FRED Federal Reserve Bank. 

Additional Resource: Historical Population Estimates are also available from New Mexico-IBIS:
They are the 1-year estimates used in the New Mexico Department of Health, and are produced by the University of New Mexico Geospatial and Population Studies (GPS) program:

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