 Route 15, which retained its number in the 1955 Louisiana Highway renumbering, followed the path of current LA 864 and LA 4/LA 17 through town at this time.In the early 1940s, Front Street was completed along the now-abandoned Missouri Pacific Railroad line, streamlining the path of Route 15 through Winnsboro.The Route 16 designation was then extended west into town to maintain its junction with Route 15.