What is the longest interstate in the United States?

Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast, ending in Boston, Massachusetts.



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Route 66 became a popular route because of the active promotion of the U.S 66 Highway Association, which advertised it as “the shortest, best and most scenic route from Chicago through St. Louis to Los Angeles.”

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The top 10 states with the best roads and highways include:
  • #1. Kansas. Thanks to its recent funding increase and overall improvements, the great state of Kansas lands at the top of our list. ...
  • #2. Alabama. ...
  • #3. North Dakota. ...
  • #4. Kentucky. ...
  • #5. Florida. ...
  • #6. Idaho. ...
  • #7. New Hampshire. ...
  • #8. Georgia.


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The states that are not part of the Interstate Highway System are Alaska, Hawaii, and Puerto Rico. All 50 states have at least some highways funded by the Interstate Highway System. Yes, even Alaska and Hawaii. And Puerto Rico, as well, has a few highways funded.

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