Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Copper Country Bus Line - served Calumet, Laurium, Ahmeek, Lake Linden, Hubbell, Mohawk.
Iron Mountain-Kingsford Transit Lines - city and suburban served Powers, Vulcan, Crystal Falls, Iron Mountain, Kingsford, Norway, Niagara WI.
Shubat Bus Co. - served Iron River, Stambaugh, Caspian, Gaston, Crystal Falls, Sagola, Iron Mountain.
Booth Transportation Line - served Sault Ste. Marie, existed in 1930's.
McGregor's Bus Lines - operated from St. Ignace to Manistique, sold to Northland Greyhound Lines in 1944.
Northern Line - served Marquette, existed in 1930's.