Interstate 90 (I-90) is the longest Interstate Highway in the United States at 3,099.07 miles. 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.
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I-90 Route Details:
Massachusetts, New York, Pennsylvania, Ohio, Indiana, Illinois, Wisconsin, Minnesota, South Dakota, Wyoming, Montana, Idaho, Washington.
Boston, Worcester, Albany, Syracuse, Buffalo, Erie, Cleveland, Chicago, Madison, Sioux Falls, Seattle