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.
Harry Cohen - existed in 1920's to 1930's.
Connecticut Motor Transportation Co. - existed in 1920's to 1930's.
Hartford-Pittsfield & Albany Bus Line - existed in 1930's.
Hartford-Providence Bus Line - existed in 1930's.
Hartford-Springfield Bee Line - existed in 1930's.
Edward Hayes Bus Service - existed in 1950's to 1960's.
New-Way Transportation Co. - existed in 1930's.
Providence-Hartford-Norwich Lines - existed in 1930's to 1940's.
R & H Bus Line - existed in 1950's to 1960's.
Silver Lane Bus Line - connected Hartford with East Hartford, Manchester, existed in 1930's to 1950's.