Main routes generally still existed in 1976.
Hiawatha Coaches - operated 1967-1988 (to Greyhound)
Original route: Tomah-La Crosse-Austin MN
North Central Bus Lines - operated until 1967 (to Wisconsin Northern/below)
Original route: Eau Claire-Ladysmith-Prentice/Park Falls
Prior to 1943 was Ladysmith Bus Line
1943-1946 service suspended
Seymour Bus Line - operated 1943-1986
Original route: Green Bay-Waupaca
Wisconsin Northern Transportation Co. - operated 1931-1992
Original route: Eau Claire-Rice Lake-Superior
Zephyr Lines (Wisconsin Division) - operated 1939-1993
Original route: Minneapolis-Ashland WI
1980-1991 was Four Star Lines
1991-1993 was Northfield Lines
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.
Badger Bus Lines - operated until 1979
Original route: Madison-Monroe-Freeport
Prior to 1943 was Southern Wisconsin Transportation Co.
Calvetti Transportation Co. - operated 1932-1948
Original route: Ironwood MI-Hurley-Mellen
Central Valley Bus Lines - operated until 1957
Original route: Stevens Point-Wisconsin Rapids-Marshfield
Prior to 1947 was Buick Bus Line
Fox River Bus Co. - operated 1929-1951 (to Northland Greyhound Lines)
Original route: Appleton-Stevens Point
Gray Diamond Line - operated 1930's-1953
Original route: Fond Du Lac-Ripon-Berlin-Oshkosh
Green Bay Stages - operated 1936-1948 (to Northland Greyhound Lines)
Original route: Green Bay-Sheboygan
Affiliated with Green Bay Wausau Lines 1946-1948
Land O' Lakes Bus Co. - operated 1929-1952 (to Green Bay Wausau Lines later Wisconsin Michigan Coaches/previous page)
Original route: Stevens Point-Antigo-Land O' Lakes
Stewart Bus Line - operated until 1968
Original route: Eau Claire-Rochester MN
1966-1967 was Johnny Transit Lines
1967-1968 was Stewart Lines
Winneshiek Stages - operated until 1949
Original route: La Crosse-Viroqua
Yellow Motor Bus Co. - operated 1933-1943 (to Northland Greyhound Lines)
Original route: Oshkosh-Stevens Point
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 many bus companies listed above, a year is indicated for when that company was issued a Certificate of Convenience and Necessity.