Interstate 90

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Interstate 90 marker

Main route of the Interstate Highway System
Main • Auxiliary • Business

Interstate 90 (I-90) is the longest Interstate Highway in the United States at 3,099.07 miles (4,987 km). It is the northernmost coast-to-coast interstate, and parallels U.S. Route 20 for the most part. Its western terminus is in Seattle, Washington, at 4th Avenue S. next to Safeco Field and Qwest Field, and its eastern terminus is in Boston, Massachusetts, at Route 1A near Logan International Airport. It crosses the Continental Divide over Homestake Pass just east of Butte, Montana.

East of the Wisconsin-Illinois border, much of I-90 is tolled, along the following toll roads (several of which predate the Interstate system): the Jane Addams Memorial Tollway, Chicago Skyway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike, including the Ted Williams Tunnel. It is free through downtown Chicago; Greater Cleveland and the rest of northeastern Ohio; Pennsylvania; and through brief sections near Buffalo, Albany, and Boston.

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