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US 23 uses the following unsigned state roads:
Except in Jacksonville, US 23 is concurrent with US 1 south of Alma, Georgia.
US 23 was extended into Florida along US 1 in 1951. When the 20th Street Expressway was built around downtown Jacksonville, US 1 was moved but US 23 remained. It has never changed its route in Florida, though at one time it was planned to extend south, maybe to Fort Myers via US 17, SR 19 , SR 33 , US 98, US 17, and SR 31 .
Note: the below description runs from north to south, while this page runs from south to north.
US 23 enters Kentucky in the city of South Shore, located in Greenup County. It follows the Ohio River, passing through the cities of Raceland, Greenup, Flatwoods and Russell, before entering Ashland, in Boyd County. It goes south, through Catlettsburg, Kentucky before reaching Lawrence County. The major city in Lawrence County it passes through is Louisa. Then it enters Johnson County and the county seat of Paintsville.
After leaving Johnson County, it enters Floyd County and the town of Prestonsburg. Then it enters Pike County, Kentucky and the city of Pikeville, Kentucky. Finally, it goes for a short time through Letcher County, Kentucky and the town of Jenkins, Kentucky before heading into Virginia.