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 at Dorset and Dorset to West Andover was canceled. In 1935, Route 84 was redirected from Madison to Ashtabula along the previous State Route 307 alignment, which had no number before 1933.