As of August 2024, the longest highway in the United States was U.S. Route 20, covering ***** miles from Boston, Massachusetts, to Newport, Oregon. Following in the ranking was U.S. Route 6 spanning ***** miles from Provincetown, Massachusetts to Bishop, California.
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HowStuffWorks. (August 25, 2024). Longest highways in the United States as of August 2024 (in miles) [Graph]. In Statista. Retrieved July 12, 2025, from https://www.statista.com/statistics/1494006/longest-highways-us/
HowStuffWorks. "Longest highways in the United States as of August 2024 (in miles)." Chart. August 25, 2024. Statista. Accessed July 12, 2025. https://www.statista.com/statistics/1494006/longest-highways-us/
HowStuffWorks. (2024). Longest highways in the United States as of August 2024 (in miles). Statista. Statista Inc.. Accessed: July 12, 2025. https://www.statista.com/statistics/1494006/longest-highways-us/
HowStuffWorks. "Longest Highways in The United States as of August 2024 (in Miles)." Statista, Statista Inc., 25 Aug 2024, https://www.statista.com/statistics/1494006/longest-highways-us/
HowStuffWorks, Longest highways in the United States as of August 2024 (in miles) Statista, https://www.statista.com/statistics/1494006/longest-highways-us/ (last visited July 12, 2025)
Longest highways in the United States as of August 2024 (in miles) [Graph], HowStuffWorks, August 25, 2024. [Online]. Available: https://www.statista.com/statistics/1494006/longest-highways-us/
