Additional bus companies, listed as existing during 1930's, are mentioned in the WPA American Guide Series of state guidebooks.
Augusta-Belfast Stages - existed in 1930's.
John T. Cyr & Sons - connected Bangor with Great Works, Old Town, Milford, Bradley, Eddington, North Brewer. In 1984 acquired bus route from Bangor & Aroostook Railroad Co.
Staples Motor Coaches - connected Bangor with Holden, Ellsworth, Trenton, Bar Harbor.
Goldthwait's Bus Line - city service in Biddeford Pool.
Falmouth Transportation Co. - served Falmouth, Cumberland Center, Pownal, State School, Gorham, South Windham.
Boothbay Harbor-Wiscasset Bus Line - served Boothbay Harbor, Wiscasset, Ocean Point, Southport, Liniken.
Brunswick Transportation Co. - served Brunswick, Topsham, Penobscot, Richmond, Westbrook, Gorham, Pownal. From 1964 to 1979 operated a former Greyhound route between Portland and Berlin.
Maine-New Hampshire Stages - existed in 1930's.
Rumford & Mexico Bus Line - no further information.
Taylor's Bus Line - based in Oquossoc, served Rangeley, Rumford.
Triangle Bus Lines - based in Farmington, also existed in 1930's.