Tooele County sits in the northwest portion of the state. The eastern borders of the county cover Davis, Salt Lake, and Utah Counties. Box Elder County sits to the north of Tooele, and Juab County sits to the south. The western section of the county contains the Great Salt Lake Desert and the city of Wendover. Box Elder extends to the Utah/Nevada border.
Weber County is the second smallest county in Utah by land area. The largest city in Weber County is Ogden. Weber County borders the Great Salt Lake on the west, Clearfield on the south, and extends just north of Willard Bay. A significant portion of the county includes parts of the Wasatch Mountain Range.