U.S. Route 1: A 545-Mile Journey Along Florida's Atlantic Coastline

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: Spanning 545 miles from the southernmost point of Key West to the Georgia border, U.S. Route 1 serves as a vital artery for Florida. This historic highway, established in 1926, weaves through the state's eastern counties, connecting urban centers, coastal communities, and critical infrastructure while maintaining a hidden network of state designations.

Designated when the U.S. Numbered Highway System was created in 1926, U.S. Route 1 is maintained by the Florida Department of Transportation. While it is widely recognized by its national name, the entire route carries hidden state-level designations, such as SR 5, SR 9, and SR 15, which shift depending on the specific segment. The road begins in Key West at the intersection of Whitehead and Fleming streets, where it initially carries the name Overseas Highway. This section is famous for its bridge crossings, including the Seven Mile Bridge and the Bahia Honda Bridge, which connect the lower Keys to the mainland.

Upon reaching the mainland, the highway transitions into the South Dixie Highway in Miami-Dade County, where it runs parallel to the South Dade TransitWay and the Metrorail line. As it heads north, the road takes on various local names, such as Biscayne Boulevard in Miami and Federal Highway in Fort Lauderdale. The route is characterized by its proximity to the Atlantic Ocean and the Intracoastal Waterway, often running parallel to Interstate 95 and State Road A1A. In some areas, such as near the Fort Lauderdale-Hollywood International Airport or in parts of Palm Beach County, US 1 shares its path with SR A1A, creating temporary concurrencies.

The highway serves as more than just a transit route; it is a designated Blue Star Memorial Highway. Its path is marked by significant infrastructure, including the New River Tunnel in Fort Lauderdale and various bridges that provide access to barrier islands. In 2016, the segment between Sarno Road and Eau Gallie Boulevard in Brevard County saw an average of 52,460 vehicles daily. As it approaches its northern terminus, the road curves inland toward the St. Marys River, finally crossing into Georgia south of Folkston and north of Boulogne, marking the end of its long journey through the easternmost tier of Florida's counties.

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