Main routes generally still existed in 1976.
Canyon Transportation Co. - operated until 1970 (to Rimrock Stages/below)
Original route: Helena-Roundup
1970-1972 service suspended
Clark Fork Valley Express - operated 1972-1977 (to Rimrock Stages/below)
Original route: Bozeman-Helena-Missoula-Kalispell
Glacier Transportation Co. - operated until 1976
Original route: Great Falls-Glacier Park
Intermountain Transportation Co. - operated 1920-1994 (to Rimrock Stages/below)
Operated throughout Montana
Meisinger Stages - operated until 1938 (to Intermountain Transportation Co./above)
Original route: Salmon MT-Blackfoot ID
Neville Transit Co. - operated until 1985
Original route: Regway SK-Plentywood-Glendive
Rimrock Stages - operated 1972-2013
Acquired routes from above companies
Trailways member (Rimrock Trailways) 1993-2006
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.