Weber County is a county located in the U.S. state of Utah. As of the 2010 census, the population was 231,236, making it the fourth-most populous county in Utah. Its county seat and largest city is Ogden, the home of Weber State University. The county was formed in 1850 and named after the Weber River, which in turn was named for John Henry Weber (1779–1859), a fur trapper and trader in the area in the mid-1820s.
Historically Weber County stretched from the California, Oregon, Utah Territory border in the north west, to the current boundary in the south east. As Nevada and the State of Utah evolved, Weber County shrunk to its current size. It currently occupies a stretch of the Wasatch Front, part of the eastern shores of Great Salt Lake, and much of the rugged Wasatch Mountains. Today, it shares a border with Cache County to the north, Rich County to the northeast, Morgan County to the southeast, Davis County to the south, Tooele County to the southwest, and Box Elder County to the north and west.