Additional bus companies, listed as existing during additional years or decades, are mentioned in old City Directories, and in the WPA American Guide Series of state guidebooks.
Suburban and interurban bus companies listed in the Russell's Official National Motor Coach Guide, which was primarily a resource for intercity bus lines.
Decker Bus Line (to Fremont and Big Rapids, 1946-1989)
Bolt Highway-Wolf Lake Transit Co. - connected Muskegon with Bolt Highway, Wolf Lake.
Muskegon Heights Motor Coach Co. - connected Muskegon with suburban district on Lake Harbor, existed in 1940's to 1950's.
North Muskegon Bus Line - connected Muskegon with North Muskegon, Michigan State Park, existed in 1920's to 1950's.
White Line Bus Co. - served Muskegon and suburbs.
Central Michigan Motor Coach Lines - existed in 1920's to 1930's.