 It was renumbered State Route 126 in the 1928 renumbering and State Route 84 in the 1933 renumbering.A 6.38-mile (10.27 km) extension from Grundy northwest towards Kentucky was added in 1932, and the rest to the state line was added in 1936.In the 1940 renumbering, SR 84 was renumbered State Route 4 to match Kentucky Route 4.