Connecticut Transit (CTTRANSIT) is the Connecticut Department of Transportation (CDOT)-owned bus service. Several companies under contract to CDOT operate services in metropolitan areas throughout Connecticut.

CTTRANSIT in the Hartford, New Haven & Stamford metro areas
CTTRANSIT Hartford operates over 30 local and 12 express bus routes. Many local routes operate 7 days a week, serving 26 towns in the Capital Region. CTTRANSIT Hartford makes connections with Middletown Area Transit, and CTTRANSIT New Britain.

CTTRANSIT New Haven operates 7 days a week over 22 local routes, connecting with other state-owned or subsidized bus services in Meriden, Wallingford, Milford, and the lower Naugatuck Valley areas, as well as with the New Haven Line and Shore Line East rail services.

CTTRANSIT Stamford operates 15 local bus routes 7 days a week. CTTRANSIT Stamford buses connect with other state-subsidized services in Norwalk, with the New Haven Line in several locations, the Harlem Line on Metro-North Railroad, and with Bee-Line buses in Westchester County New York. CTTRANSIT Stamford also operates the I-BUS, an express service between downtown Stamford and White Plains, New York.

CTTRANSIT Waterbury
CTTRANSIT Waterbury operates fixed route services in the Waterbury area through a contract with the Northeast Transportation Company. Service is provided to Waterbury, Watertown and Naugatuck Monday through Saturday, as well as some Sunday service in greater Waterbury.

CTTRANSIT New Britain & Bristol
The New Britain Transportation Company operates nine bus routes in Berlin, New Britain, Cromwell, Newington, Plainville, Bristol and Meriden. Fixed route bus service operates Monday through Saturday. CTTRANSIT New Britain makes connections with Middletown Area Transit, CTTRANSIT Meriden and CTTRANSIT Hartford.

DATTCO also operates fixed route service Monday through Saturday in New Britain on the East Street and South Street routes.

CTTRANSIT Meriden & Wallingford
CTTRANSIT Meriden and Wallingford operate fixed route services in their respective areas through a contract with Northeast Transportation Company, with four local routes. Connections are made in Wallingford and Meriden to CTTRANSIT New Haven, as well as in Meriden to Middletown Area Transit.