Grantsville is the second most populous city in Tooele County, Utah, United States. It is part of the Salt Lake City, Utah Metropolitan Statistical Area. The population was 12,617 at the 2020 census. The city has grown slowly and steadily throughout most of its existence, but rapid increases in growth occurred during the 1970s, 1990s, and 2010s. Recent rapid growth has been attributed to being close to Salt Lake City, small town community feel, lower housing costs than Salt Lake County, the nearby Deseret Peak recreational center, the Utah Motorsports Campus raceway, and the newly built Wal-Mart distribution center located just outside the city. It is quickly becoming a bedroom community for commuters into the Salt Lake Valley.

Tooele County is a county in the U.S. state of Utah. As of the 2020 United States Census, the population was 72,698. Its county seat and largest city is Tooele. The county was created in 1850 and organized the following year.