The United States Numbered Highway System is a nationwide system with only a small portion of its routes entering Utah.

Originally, the State Road Commission of Utah, created on March 23, 1909, was responsible for maintenance, but these duties were rolled into the new UDOT in 1975.

The longest is U.S. Route 89 at 502.577 miles (808.819 km) and the shortest is U.S. Route 89A at 2.94 miles (4.73 km).

Highways exist in the state of Utah; of these, five have been replaced by current interstate and U.S.

Highways, while the other was replaced by a state route.