Suburban and interurban bus companies listed in the Russell's Official National Motor Coach Guide, which was primarily a resource for intercity bus lines.
Cardinal Buses (around South Bend, 1923-1976)
Yoder Bus Lines (Elkhart to Nappanee, until 1949)
Middlebury Bus Line (Goshen to Middlebury and Topeka, until 1978)
Garman Coach Line - served Goshen, Dunlap, Elkhart.
River Valley Lines - served Mishawaka and South Bend.
Indiana Motor Bus