Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Cedar Rapids & Ottumwa Line - existed in 1930's.
Des Moines-Winterset - existed in 1930's.
Gwinner Bus Lines - served Fort Dodge, Lehigh, Dayton.
Hampton Bus Co. - served Maquoketa, Anamosa, Cedar Rapids.
Manawa Bus Lines - served Council Bluffs to Lake Manawa.
Manchester & Oneida Railway Co. - served Manchester to Oneida.
Suburban Bus Line - connected Des Moines with Runnells, Adelphi, Woodland, Carbondale, Youngstown.
Thornton Bus Lines - served Griswold, Treynor, Council Bluffs, Omaha NE.
Walrod Bus Line - existed in 1930's, served Clinton.
Wendt Motor Bus Line - existed in 1930's, served Keokuk.
White Star - existed in 1930's, served Sioux City.