List of Interstate Highways in Utah
The Interstate Highways in Utah are maintained by the Utah Department of Transportation (UDOT). The Interstate Highway System is a nationwide system with only a small portion of these 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. There are of Interstates within the state. The longest is Interstate 15 (I-15) at and the shortest is I-215 at . One unique former route is Interstate 415, which was never signed as such, and was only used as a temporary designation for the eastern portion of what is now the Interstate 215 belt loop around Salt Lake City.
Interstate 95
With a length of , I-95 is the longest north–south Interstate and the sixth-longest Interstate Highway overall. I-95 passes through more states than any other Interstate Highway at 15 states (as well as a very brief stretch in the District of Columbia while crossing the Potomac River), followed by I-90, which crosses 13 states. According to the U.S. Census Bureau, only five of the 96 counties (or equivalents) along the route are completely rural, while statistics provided by the I-95 Corridor Coalition suggest that the region served is "over three times more densely populated than the U.S. average and as densely settled as much of Western Europe". According to the Corridor Coalition, I-95 serves 110 million people and facilitates 40 percent of the country’s gross domestic product.