Bridgeport Auto Transit Co. - city service in Bridgeport and Stratford.
Chestnut Hill Bus Corp. - served Bridgeport and suburbs.
Gray Line Bus Corp. - city service in Bridgeport.
Huntington Road-Stratford Bus Lines - city service in Bridgeport and Stratford.
Trumbull Coach Lines - served Bridgeport and Trumbull.
White Line Bus Corp. - connected Bridgeport with Trumbull.
Danbury-Brewster Bus Corp. - connected Danbury with Brewster NY.
Silver Lane Bus Line - connected Hartford with East Hartford, Manchester.
Corbin Avenue Bus Service - city service in New Britain.
East Street Bus Line - city service in New Britain.
Mastco Bus Line - city service in New Britain.
Orange Street Bus Line - city service in New Haven.
Rose's Bus Service - city service in Wallingford.
New London-Niantic Coach Co. - suburban served New London to Old Lyme.
Intercity Coach Co. - served Danbury, Bethel, Newtown, Bridgeport. Listed in Russell's Guide into 1950's.
Intercity Coach Co. - served Torrington, Litchfield, Bantam, New Preston, New Milford, Danbury, Norfolk, Brewster NY.
Intercity Valley Line - served Bridgeport to Waterbury.
Bus companies operating over longer distances than the above suburban and interurban companies, but not listed in the Russell's Guide.
Flying Eagle Whiteway Lines - intercity served Hartford, Bristol, Waterbury, Danbury, New York City.
Lakeland Transportation Co. - intercity served Canaan to Poughkeepsie NY.