Massachusetts Bay Transportation Authority: Provides public transportation in the greater Boston area. Maps and schedules for commuter rail, and subway service.
Massachusetts Port Authority: Operates Logan International Airport and other facilities in the Commonwealth.
Massachusetts Turnpike Authority: Operates the Massachusetts Turnpike, an east-west highway from Boston to West Stockbridge on the New York border.
Massachusetts Water Resources Authority: Provides drinking water and wastewater treatment services to the greater Boston area.