In 1931, the route was truncated at Dorset and Dorset to West Andover was decertified. In 1935, Route 84 was rerouted from Madison to Ashtabula along the previous State Route 307 alignment, which was unnumbered before 1933.
In 1931, the route between Dorset and Dorset to West Andover was discontinued. In 1935, Route 84 was rerouted from Madison to Ashtabula along the old State Route 307 alignment, which lacked a number before 1933.