San Juan County Colorado has a total area of 388.29 square miles. It has the highest mean elevation of any county in the United States at 11,240 feet. Silverton, the county seat, and the only city in the county, sits at 9,318 feet. San Juan County is recognized worldwide for premier big game hunting, hiking, fishing and numerous summer outdoor activities. More recently we have become a winter destination for snow enthusiasts. Boasting the highest mean elevation of any county in the United States, we have countless snowmobile and cross country trails as well as world class ice climbing to go with skiing and snowboarding rivaled only by your imagination.