List of Interstate Highways in Colorado

Interstate Highways of the Colorado State Highway System
Standard highway markers used in the state of Colorado for Interstate 70, Interstate 225, and Interstate 76 Business
Interstate Highways highlighted in red
System information
Maintained by CDOT
Length	956 mi[1] (1,539 km)
Formed	October 11, 1964[1]
Highway names
Interstates	Interstate X (I-X)
Business routes:	Interstate X Business (I-X Bus.)
System links
Colorado State Highway System Interstate US State Scenic

The Interstate Highways in Colorado are the segments of the national Dwight D. Eisenhower System of Interstate and Defense Highways that are owned and maintained by the state of Colorado, totaling about 956 miles (1,539 km).^[1] Colorado has three main highways (two-digit routes), and two auxiliary highways (three-digit routes), totaling five Interstates, all are located within the Denver metropolitan area. The longest Interstate in Colorado is Interstate 70 (I-70), which is 449.58 miles (723.53 km)^[2] There are also 17 active business routes and seven former business routes, most of them are from I-70. The last segment of Interstate Highway to open up to date was I-76, which was between Pecos Street and I-25 northwest of Denver.^[1]