Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Additional bus companies, listed as existing during additional years or decades, are mentioned in old City Directories, and in the WPA American Guide Series of state guidebooks.
Suburban and interurban bus companies listed in the Russell's Official National Motor Coach Guide, which was primarily a resource for intercity bus lines.
Wabash Valley Coach Co. (to Vincennes and Evansville, by 1920's-1974)
Wabash Valley Lines (to Casey IL, until 1953)
Western Indiana Coach (to Crawfordsville, until 1969)
Western Motor Lines (to Paris IL, by 1920's-1952)
Blue & Gray Bus Line - existed in 1920's to 1940's.
Clinton-Terre Haute Bus Line - existed in 1920's to 1940's.
Hunt's Bus Line - existed in 1950's to 1960's.
R. F. Johnson Bus Line - served Terre Haute, Ashboro, Clay City, Coal City, Worthington, Linton, Crane.
National Motor Transit Co. - existed in 1930's.
Ricauda Stages - existed in 1950's to 1960's.