U.S. Route 23 in Florida

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U.S. Highway 23
US 23 highlighted in red
Route information
Maintained by FDOT
Length	37.656 mi[1] (60.601 km)
Existed	1950–present
Major junctions
South end	US 1 / US 17 / SR 228 in Jacksonville
Major intersections	I-95 / US 17 / SR 228 in Jacksonville US 301 in Callahan
North end	US 1 / US 23 / US 301 / SR 4 / SR 15 towards Folkston, GA
Location
Country	United States
State	Florida
Counties	Duval, Nassau
Highway system
United States Numbered Highway System List Special Divided Florida State Highway System Interstate US State Former Pre‑1945 Toll Scenic
← SR 22 → SR 23
← SR 136 SR 139 → SR 143

U.S. Highway 23 (US 23) is a United States Numbered Highway that runs from Jacksonville, Florida, to Mackinaw City, Michigan. In the U.S. state of Florida, US 23 is concurrent with US 1 south of Alma, Georgia, except in Downtown Jacksonville. US 23 is also concurrent with US 301 between Homeland, Georgia, and Callahan. In the Jacksonville area, US 23 is the unsigned State Road 139 (SR 139), which also continues east from the south end of US 23 along SR 10A to SR 115 near the Mathews Bridge.