Beginning in 1921, intrastate bus service was regulated by the Ohio Public Utilities Commission. The Annual Reports included lists of the bus companies through 1932, information included in the reports varied over the years.
Bus Companies 1922
Bus Companies Late 1920's (A-L)
Bus Companies Late 1920's (M-Z)
Bus Companies Early 1930's (Ceased Operations)
Bus Companies Early 1930's (Continued Operations)