Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Cumberland & Westernport Transit Co. - existed at least since 1930's, suburban served Cumberland, Frostburg, Westernport, Mt. Savage, Amcelle.
Franklin Cumberland Transit Co. - existed in 1930's.
Mt. Savage Bus Lines - existed at least since 1920's, served Mt. Savage to Cumberland to Celanese.
Ridgley Bus Co. - existed in 1930's.