Bus companies generally listed in the July 1942 Russell's Guide or the 1952 Mass Transportation's Directory, and their predecessor and successor companies. This list is somewhat arbitrary and provides a general overview. Some available beginning dates are from early reports of the Ohio Public Utilities Commission, indicating a Certificate of Convenience and Necessity.
A&M Transit Lines - operated until 1959
Original route: Alliance-Akron
Prior to 1944 was Alliance-Akron Transit Co.
Buckeye Stages - operated 1926-1969
Original route: Findlay-Fostoria-Fremont
Prior to 1948 was Findlay-Fremont Bus Line
Chillicothe-Jackson Coach Co. - operated 1929-1944 (to Atlantic Greyhound Lines)
Original route: Chillicothe to Gallipolis and London
Cleveland-Lorain Highway Coach - operated 1924-1987
Original route: Cleveland-Lorain
1984-1987 was SBS Transit
Croswell Transportation Co. - operated 1929-1960
Original route: Cincinnati-Williamsburg-Portsmouth
Dayton & Southeastern Lines - operated until 1972
Original route: Dayton-Springfield-Chillicothe
Galion-Mansfield Transit Co. - operated 1927-1954
Original route: Mansfield-Galion-Marion
Glouster-Athens Auto Bus Co. - operated 1923-1954 (to Zane Transit Lines/Ohio Trailways)
Original route: Corning-Glouster-Athens
Greenfield-Cincinnati Bus Line - operated until 1945
Original route: Greenfield-Cincinnati
Hamilton-Oxford Bus Line - operated 1924-1948 (to Ohio Bus Line/previous page)
Original route: Hamilton-Oxford
King Brothers Lines - operated 1922-1948
Operated various directions from Cincinnati
Lima-Ada Bus Line - operated 1927-1944
Original route: Lima-Ada
Loudonville-Oberlin Coach Line - operated 1947-1952
Original route: Loudonville-Oberlin
McDonald Bus Lines - operated 1947-1948
Original route: Youngstown-Conneaut
Newark-Lancaster Coach Line - operated until 1948 (to Lake Shore System/previous page)
Original route: Newark-Lancaster
Oxford Coach Lines - operated 1947-1956
Original route: Oxford-Middletown
Paulding-Fort Wayne Bus Line - operated 1927-1953
Original route: Paulding-Fort Wayne
Red Eagle Bus Co. - operated until 1923-1945 (to Ohio Greyhound Lines)
Original route: Canton-Millersburg-Columbus
Shelby Transit Co. - operated until 1945
Original route: Marion-Bellefontaine-Greenville
Smithfield-Adena Bus Co. - operated until 1950
Operated various directions from Smithfield
Sterling Stages - operated until 1984
Original route: Warren to Ashtabula and Sharon PA
Warren-Newton Falls Transportation Co. - operated until 1962
Original route: Warren-Newton Falls-Leavittsburg
Prior to 1947 was Newton Falls-Warren Bus Line
1960-1962 was Warren Suburban
Warren-Salem Transit Line - operated until 1950
Original route: Warren-Salem
William Penn Short Lines - operated until 1948
Original route: Steubenville-Cambridge
Xenia-Hillsboro Bus Co. - operated 1931-1952 (to Dayton Southeastern/above)
Original route: Hillsboro to Xenia and Washington Court House