What is the Longest Interstate in the United States


The lengths of interstates can change due to construction, extensions, or other modifications to the highway system. Here we have shared the longest interstate in the United States of America.

Longest Interstate in the United States

The longest interstate in the United States is Interstate 90 (I-90). I-90 spans approximately 3,020 miles from Seattle, Washington, on the west coast to Boston, Massachusetts, on the east coast. It is a major transcontinental highway that connects the Pacific Northwest with the Atlantic Northeast.

I-90 is significant for several reasons

Transcontinental Route: Interstate 90 is one of the primary east-west routes in the Interstate Highway System, providing a direct and continuous route from the Pacific Ocean to the Atlantic Ocean. This makes it a key transportation corridor for both passenger and freight traffic, facilitating commerce and travel across the country.

Major Cities and Regions: I-90 passes through or near several major cities and regions, including Seattle, Spokane, Billings, Rapid City, Sioux Falls, Minneapolis, Chicago, Cleveland, Buffalo, and Boston. Its route connects diverse landscapes and urban areas, contributing to its importance for both regional and long-distance travel.

Economic Significance: The highway plays a crucial role in the economic development of the regions it traverses. It facilitates the movement of goods and services, linking businesses and industries across the country. The accessibility provided by I-90 contributes to economic growth and trade.

Tourism and Recreation: Interstate 90 also passes through scenic areas and tourist destinations, such as national parks and recreational areas. This makes it a popular route for travelers seeking to explore various landscapes and attractions along the way.

Top 10 Longest Interstate in the United States

Here is a list of some of the longest Interstate Highways in the United States based on their approximate length.

Keep in mind that the lengths of these highways may have changed due to construction or other factors, so it’s advisable to check with recent sources for the most up-to-date information:

  1. Interstate 90 (I-90): Seattle, Washington, to Boston, Massachusetts – Approximately 3,020 miles.
  2. Interstate 80 (I-80): San Francisco, California, to Teaneck, New Jersey – Approximately 2,899 miles.
  3. Interstate 40 (I-40): Barstow, California, to Wilmington, North Carolina – Approximately 2,555 miles.
  4. Interstate 10 (I-10): Santa Monica, California, to Jacksonville, Florida – Approximately 2,460 miles.
  5. Interstate 70 (I-70): Cove Fort, Utah, to Baltimore, Maryland – Approximately 2,153 miles.
  6. Interstate 20 (I-20): Kent, Texas, to Florence, South Carolina – Approximately 1,535 miles.
  7. Interstate 30 (I-30): Barstow, California, to Little Rock, Arkansas – Approximately 1,488 miles.
  8. Interstate 5 (I-5): San Ysidro, California, to Blaine, Washington – Approximately 1,381 miles.
  9. Interstate 95 (I-95): Miami, Florida, to Houlton, Maine – Approximately 1,919 miles (Note: I-95 is discontinuous in some areas, so the total length includes non-contiguous segments).
  10. Interstate 35 (I-35): Laredo, Texas, to Duluth, Minnesota – Approximately 1,568 miles.


Please enter your comment!
Please enter your name here