Mileage: 3,020.54. The longest interstate highway in the United States, as well as the northernmost coast-to-coast one. It spans 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, and Massachusetts. Major cities served include Seattle, Bellevue, Ellensburg, Spokane, Kellogg, Wallace, Missoula, Deer Lodge, Butte, Laurel, Sheridan, Gillette, Rapid City, Chamberlain, Mitchell, Sioux Falls, Worthington, Fairmont, Rochester, La Crosse, Onalaska, Elgin, Chicago, Hammond, Gary, Toledo, Cleveland, Ashtabula, Erie, Buffalo, Rochester, Syracuse, Utica, Amsterdam, Schenectady, Albany, Springfield, Worcester, Framingham, and Boston.
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