Kentucky Route 61 (KY 61) is a 148.006 mile (238.193 km) long Kentucky State Highway extending north from the Tennessee state line in Cumberland County to Columbia in Adair County through to Greensburg in Green County. From there, the route traverses Larue, Hardin and Bullitt counties to terminate in Jefferson County (where it is commonly signed as Preston Street or Preston Highway) at the junction of U.S. Route 31E (East Main Street) in downtown Louisville.