Interstates by State

This list breaks down the Interstate-Guide by states (and the District of Columbia) and including current, former, future and unsigned routes. Interstate mileage statistics provided for each state and D.C. were obtained from the December 31, 2016 Interstate Route Log and Finders List.

Page Updated June 13, 2017.



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An original Interstate era sign directing motorists to the Chicago Skyway and the Northwest Indiana Interstate network. Photo taken by Jeff Royston (05/26/12).
It was determined by the city of Chicago that the Chicago Skyway was never formally included in the Interstate Highway System in 1999. As such, trailblazers are posted in lieu of reassurance markers along the toll road.
Oklahoma Veterans Memorial Highway System sign posted at the northbound welcome center near Thackerville. Photo taken 10/10/03.
Interstates are commonly dedicated as war memorial highways throughout the United States. One such designation is the Purple Heart Trail, which originates at a monument in Mt. Vernon, Virginia. Purple Heart Trail routes include I-5 in California, I-35 in Texas and I-95 between Augusta and Holton, Maine.