Kentucky Route 3 originates at a junction with
U.S. Highway 23 west of
Prestonsburg in
Floyd County, Kentucky,
United States. The route continues through
Johnson,
Martin and
Lawrence counties to terminate at another junction with
U.S. Highway 23 south of
Catlettsburg in
Boyd County. From South Catlettsburg to Louisa it follows the original routing of U.S. 23. It intersects
KY-180, which parallels
I-64, after . At this intersection, you turn right to stay on KY-3. The road continues to the Lawrence County line. In Lawrence County, it passes
KY-1 and
KY-1185, which takes you to
Yatesville Lake. It then continues into downtown
Louisa toward
Inez and on to Prestonsburg. ==Major intersections==