Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Shawano & Wausau Bus Line - existed in 1930's, possibly evolved to Green Bay Wausau Lines, later Wisconsin Michigan Coach.
Central Wisconsin Transportation Co. - began operations in 1929, served Madison and Middleton, at least into 1950's.
Hiawatha Stage Line - began operations in 1938, served Wisconsin Dells, Portage, Pardeeville, Cambria, Randolph, Fox Lake, Beaver Dam, at least into 1950's.
East Shore Transportation Cos. - began operations in 1932, served Madison and Lake View Sanitorium.
Sioux Limited - existed in 1930's.
400 Bus Line - served Wisconsin Rapids, Port Edwards, Nekoosa, Friendship, Adams.
Tri-City Bus Co. - served Wisconsin Rapids, Port Edwards, Nekoosa, Grand Rapids, Biron.
Lake Shore Bus Co. - began operations in 1934, served Ashland, Washburn, Bayfield.
Appleton-Sheboygan Bus Line - no further information.
Two Rivers Transit - city service in Two Rivers.
Badger State Transportation Co. - served Arcadia to Winona MN and intermediate points.
Black Hawk Bus Lines - served Prairie Du Chien, Eastman, Seneca, Mount Sterling, Ferryville, De Soto, Victory, Genoa, Stoddard, La Crosse.
Bluebird Line - served Menomonie, Red Wing MN.
McCoy Western Stages - served La Crosse, West Salem, Bangor, Rockland, Camp McCoy.
Bus companies operating over longer distances than the above suburban and interurban companies, but not listed in the Russell's Guide.
Wisconsin Central Coaches - intercity served Madison, Baraboo, Reedsburg, Hillsboro, Cashton, La Crosse.
The availability of information from the Wisconsin Public Service Commission is more thorough, than the availability of similar information for most other states. Including for the issuance of each Certificate of Convenience and Necessity. For some bus companies listed above, a year is indicated for when that company was issued a Certificate of Convenience and Necessity.