Since the league's induction there have been several membership changes.Former members included Blackstone-Millville, Nipmuc, Hopedale, Blackstone Valley Tech, and Norfolk County Agriculture The TVL was formed by 12 schools who were either former members of the Southern County League or independently organized their own schedules.
The title was signed at the collegiate level but after its passing the TVL also included girls sports in its scheduling.
Norfolk Aggie, Hopedale, Nipmuc, Blackstone-Millville and BVT left the TVL with the creation of the Dual Valley Conference (DVC).
Ashland and Westwood wanted out of the Dual County League and gained TVL membership in the early 1970s.
The 12 schools that currently comprise the league are Ashland, Bellingham, Dedham, Dover-Sherborn, Holliston, Hopkinton, Medfield, Medway, Millis, Norton, Norwood, and Westwood.