Tooele County is a county located in the U.S. state of Utah, established in 1852. The county seat and largest city is Tooele. Located west of Salt Lake City, Tooele County is part of the Salt Lake City Metropolitan Statistical Area. The county encompasses a total area of 7,286 square miles, making it the second-largest county in Utah by area. The county is notable for hosting several significant military installations, including the Tooele Army Depot and portions of the Utah Test and Training Range. The Dugway Proving Ground, a major military testing facility, is also located within the county boundaries. These facilities have played important roles in national defense and contribute significantly to the local economy. Tooele County’s economy has historically been based on mining, military operations, and agriculture. The county government operates through a three-member county commission system and provides various public services to its residents. The region features diverse geography, including the Great Salt Lake Desert, the Oquirrh Mountains, and the western portion of the Great Salt Lake. The county maintains several recreational areas and historical sites, including the Bonneville Salt Flats, known for land speed records, and the Wendover Airfield Museum. The population has experienced steady growth since the 1990s, largely due to its proximity to Salt Lake City and relatively affordable housing.