Introduction
The United States is a land built for the road. With over 4 million miles of public roads and highways, it’s no surprise that some of the longest roads in the US stretch thousands of miles coast-to-coast. From the scenic Atlantic shores to the rugged Pacific cliffs, these roads have long served as lifelines for commerce, exploration, and unforgettable American road trips.
As of the latest 2023 Federal Highway Administration (FHWA) report, five highways top the list for length and travel significance. These are not just engineering marvels but also cultural corridors that have helped shape American mobility.
In this article, we’ll take a detailed look at the top 5 longest highways in the US, exploring their routes, geographic significance, travel tips, and interesting trivia. Whether you’re a seasoned road tripper or just curious about America’s infrastructure, this guide has it all.
Why Do Long Roads Matter in the US?
Long roads have been instrumental in shaping the economic, cultural, and geographic landscape of the United States. They serve more than just transportation needs—they connect cities, towns, and states, facilitate cross-country logistics, and offer an open canvas for epic American road trips.
- Cultural Icons: Highways like Route 66 and U.S. Route 20 are etched into the national memory.
- Economic Impact: Billions in goods travel daily on these arteries.
- Tourism: Long roads encourage domestic tourism and regional exploration.
- Infrastructure Insight: Understanding them gives us perspective on planning, zoning, and environmental interactions.
“A road isn’t just a path—it’s a passage through time, places, and stories.”
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Table: Top 5 Longest Roads in the US (2023 Data)
| Rank | Road Name | Total Length (Miles) | Starting Point | Ending Point |
|---|---|---|---|---|
| 1 | U.S. Route 20 | 3,365 | Boston, MA | Newport, OR |
| 2 | U.S. Route 6 | 3,207 | Bishop, CA | Provincetown, MA |
| 3 | Interstate 90 | 3,020 | Seattle, WA | Boston, MA |
| 4 | U.S. Route 30 | 3,073 | Atlantic City, NJ | Astoria, OR |
| 5 | Interstate 50 | 3,011 | Sacramento, CA | Ocean City, MD |
Top 5 Longest Roads in the US
1. U.S. Route 20 – 3,365 Miles
- From: Boston, Massachusetts
- To: Newport, Oregon
- Length: 3,365 miles
U.S. Route 20 is officially the longest road in the US. Spanning 12 states, it stretches from the Atlantic Ocean to the Pacific, cutting through America’s core. It passes, on its way, through many historical towns, major cities like Chicago and Cleveland, and vast rural landscapes.
What makes Route 20 exceptional is its blend of urban connectivity and remote beauty. It also skirts the northern edge of Yellowstone National Park, offering detours for nature lovers.
Key Takeaway: Route 20 is ideal for anyone wanting to experience a true coast-to-coast journey.
Read More: Yellowstone National Park: 5 Must-See Geothermal Wonders in Yellowstone National Park
2. U.S. Route 6 – 3,207 Miles
- From: Bishop, California
- To: Provincetown, Massachusetts
- Length: 3,207 miles
Once the longest, Route 6 lost the title after California trimmed its westward section. Yet, it remains among the longest highways in the US, traveling through 14 states.
Nicknamed the Grand Army of the Republic Highway, this road is packed with history and lesser-known gems, especially in the Midwest and Northeast.
Highlight: At one time, it connected both coasts directly, making it a nostalgic route for seasoned travelers.
Read More: 15 Incredible Places to See on Your California Road Trip for an Unbeatable Experience
3. Interstate 90 – 3,020 Miles
- From: Seattle, Washington
- To: Boston, Massachusetts
- Length: 3,020 miles
I-90 is the longest Interstate Highway in the US, known for its high-speed infrastructure and critical freight corridors. Running parallel to U.S. Route 20, it’s faster and more modern but lacks the quirky charm of smaller U.S. routes.
Still, it’s impressive. With elevated bridges, tunnels, and major city connections (like Chicago, Cleveland, and Buffalo), it’s a feat of modern engineering.
Fun Fact: It features the longest floating bridge in the world—Evergreen Point Floating Bridge in Seattle.
NLP Keywords: highway systems, national transportation, I-90 bridge, travel corridor
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4. U.S. Route 30 – 3,073 Miles
- From: Atlantic City, New Jersey
- To: Astoria, Oregon
- Length: 3,073 miles
Route 30 follows part of the historic Lincoln Highway, America’s first coast-to-coast road. It winds through industrial heartlands and scenic routes, making it a favorite for history buffs.
It’s one of the few roads that retains a strong pre-Interstate identity, often running parallel to I-80.
Must-see Places Along Route 30: Gettysburg, Fort Wayne, and Omaha.
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5. Interstate 50 – 3,011 Miles
- From: Sacramento, California
- To: Ocean City, Maryland
- Length: 3,011 miles
While not part of the Interstate Highway System by technical designation, U.S. Route 50 is one of the longest numbered highways in America. Often dubbed “The Loneliest Road in America” for its stretch across Nevada’s empty desert, it offers a diverse and peaceful cross-country experience.
This route cuts through the heartland and is known for connecting state capitals, historic towns, and national parks. It’s a favorite among solitude-seeking road trippers who want a different view of America.
Geographic Insight: U.S. Route 50 spans both coasts and crosses the Mississippi River, Rocky Mountains, and Appalachian ranges.
Read More: Top 10 Tallest Mountains of North America: Don’t Miss These Gigantic Peaks
Honorable Mentions
- U.S. Route 66 – Though no longer a formal US highway, it remains an icon of American pop culture.
Best Time to Travel These Roads
- Spring to Fall: Ideal for most routes; better weather and open parks.
- Avoid Winter Storms: Especially on I-90 and Route 20 in northern states.
- Check for Construction: Use real-time GPS and Federal Highway Updates for alerts.
Read More: Top 5 Most Vulnerable US Coastal Cities to Climate Change
Final Thoughts
As we’ve explored, the longest roads in the US are more than concrete stretches—they are a reflection of America’s history, ambition, and vast geographical beauty. From the historic charm of Route 6 to the modern marvels of I-90, these roads serve millions daily and attract thousands of travel lovers yearly.
In a country where driving is often the most flexible and adventurous way to explore, knowing about these major routes adds depth to your travel plans. Whether you’re moving goods or making memories, these highways are waiting to be explored.
So, pack your bags, check your route, and hit one of these roads. Because the journey, as they say, is just as important as the destination.
FAQs
1. What is the longest road in the US?
U.S. Route 20, spanning 3,365 miles coast to coast.
2. Are these roads good for road trips?
Yes, especially Routes 20, 6, and 30 for scenic travel.
3. Which highway runs parallel to U.S. Route 20?
Interstate 90 follows a similar route with faster access.
4. Is Route 66 one of the longest roads in the US?
No, it’s shorter and no longer part of the official U.S. highway system.
5. Which is the longest Interstate Highway?
Interstate 90, stretching 3,020 miles from Seattle to Boston.
