The 10 Longest Interstate in the United States in 2025 highlight the vastness of the American highway system, which connects cities, states, and regions across thousands of miles. These roadways are not only essential for transportation but also serve as lifelines for commerce, tourism, and daily travel. With improved infrastructure and expansions, these highways continue to play a crucial role in the nation’s economy and lifestyle.
Below is a detailed look at the longest interstate highways in the United States as of 2025.
1. Interstate 90 (I-90) – 3,021 miles
Interstate 90 remains the longest highway in the country, stretching from Boston, Massachusetts, to Seattle, Washington. Covering over 3,000 miles, it passes through 13 states, connecting New England to the Pacific Northwest. It crosses landmarks such as the Great Lakes, Chicago, and the Rocky Mountains, making it one of the most iconic routes.
2. Interstate 80 (I-80) – 2,899 miles
Running from Teaneck, New Jersey, to San Francisco, California, I-80 spans nearly 2,900 miles. It is one of the most heavily traveled routes, vital for coast-to-coast freight movement. The highway crosses the Great Plains, the Rockies, and vast stretches of desert, offering diverse landscapes for travelers.
3. Interstate 40 (I-40) – 2,555 miles
Interstate 40 runs from Barstow, California, to Wilmington, North Carolina. Covering 2,555 miles, it cuts across eight states and is one of the busiest east-west corridors. With sections following historic Route 66, it remains popular among road trippers while serving as a key trucking route.
4. Interstate 10 (I-10) – 2,460 miles
Stretching from Santa Monica, California, to Jacksonville, Florida, I-10 spans 2,460 miles across the southern United States. It connects major cities such as Los Angeles, Phoenix, Houston, New Orleans, and Tallahassee. Known for its year-round accessibility, it’s crucial for commerce and tourism across the Sun Belt.
5. Interstate 70 (I-70) – 2,153 miles
I-70 runs from Cove Fort, Utah, to Baltimore, Maryland. Covering just over 2,150 miles, it connects the Midwest with the East Coast. Known for its scenic passages through Colorado’s Rocky Mountains, it is both a vital shipping corridor and a favorite for travelers seeking breathtaking drives.
6. Interstate 95 (I-95) – 1,919 miles
Interstate 95 is the main north-south route along the East Coast, stretching from Miami, Florida, to Houlton, Maine. Covering nearly 1,920 miles, it passes through 15 states and major cities including Miami, Washington, D.C., Philadelphia, New York City, and Boston. It is one of the busiest highways in America.
7. Interstate 75 (I-75) – 1,786 miles
I-75 runs from Miami, Florida, to Sault Ste. Marie, Michigan, at the Canadian border. This 1,786-mile highway passes through major cities such as Atlanta, Cincinnati, and Detroit. It is particularly important for trade between the U.S. and Canada, as well as for tourism in Florida.
8. Interstate 94 (I-94) – 1,585 miles
Stretching from Billings, Montana, to Port Huron, Michigan, I-94 covers 1,585 miles. It serves as a major route through the northern Midwest, passing through Minneapolis, Milwaukee, and Chicago. The highway is vital for both regional commerce and cross-border traffic with Canada.
9. Interstate 35 (I-35) – 1,568 miles
Running from Laredo, Texas, at the Mexican border to Duluth, Minnesota, I-35 spans 1,568 miles. This interstate is key for North American trade, linking Mexico, the U.S., and Canada through the NAFTA corridor. It also passes through fast-growing cities such as San Antonio, Austin, Dallas, and Minneapolis.
10. Interstate 20 (I-20) – 1,539 miles
I-20 connects the Southeast to the Southwest, stretching from Kent, Texas, to Florence, South Carolina. Covering 1,539 miles, it runs through Dallas, Atlanta, and Birmingham. While shorter than some other interstates, it plays a crucial role in connecting southern commerce hubs.
Why These Highways Matter
The 10 Longest Interstate in the United States in 2025 are not just impressive in scale but also vital to the nation’s connectivity. They enable:
- Economic Growth: Highways move billions of dollars’ worth of goods daily.
- Tourism and Travel: Scenic routes and easy access encourage domestic tourism.
- National Security: Interstate systems remain essential for emergency responses and military logistics.
- Community Links: Highways tie together urban and rural regions, supporting everyday life.
Final Thoughts – Longest Interstate in the United States
The 10 Longest Interstate in the United States in 2025 showcase the scale and importance of America’s highway network. From the transcontinental I-90 to the southern stretch of I-10, these roads connect people, businesses, and cultures across thousands of miles. As the U.S. continues to invest in infrastructure upgrades, these highways will remain the backbone of transportation and commerce for decades to come.
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