Tri-Valley League (MIAA)

There are 12 Schools representing 12 towns in the Tri-Valley League. Since the league's induction there have been several membership changes.

• The Ashland High School "Clockers", left the Dual County League and joined the TVL in the early 1970s.[1]
• The Bellingham High School "Blackhawks", original 1966 TVL member.[2]
• The Dedham High School "Marauders", joined in the 2017-18 season, formerly of the Bay State Conference.[3][4]
• The Dover-Sherborn High School "Raiders", original 1966 TVL member.[5]
• The Hopkinton High School "Hillers", original 1966 TVL member.[6]
• The Holliston High School "Panthers", original 1966 TVL member.[7]
• The Medfield High School "Warriors", original 1966 TVL member.[8]
• The Medway High School "Mustangs, original 1966 TVL member.[9]
• The Millis High School "Mohawks", original 1966 TVL member.[10]
• The Norton High School "Lancers", original 1966 TVL member.[11]
• The Norwood High School "Mustangs," left the Bay State Conference after the 2017-18 school year.
• The Westwood High School "Wolverines", left the Dual County League and joined the TVL in the early 1970s.[12]

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 teams were divided into 2 divisions, Millis, Medway, Medfield, Dover-Sherborn, Holliston and Hopkinton in the Eastern Division; and Bellingham, Norton, Hopedale, Nipmuc, Norfolk Agricultural and Blackstone (which merged with Millville in 1967) in the Western Division.

In the inaugural 1966–67 season the schools competed in football, basketball, baseball, track and tennis. Millis, Medway, Medfield, Dover-Sherborn, Holliston, Hopkinton and Norton had football teams that year and Bellingham entered a team in the following 1967-68 season.

In the founding seasons, girls sports were not scheduled through the league, schedules for girls sports were organized independently by school. It was not until 1972 that Title IX was passed that stated, "No person in the United States shall, on the basis of sex, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under any education program or activity receiving Federal financial assistance." The title was signed at the collegiate level but after its passing the TVL also included girls sports in its scheduling.

In the early days of the TVL. The smaller schools were not able to compete with those with larger enrollments, so defections started to occur. Norton left for another league and the principals welcomed Blackstone Valley Tech to replace Norton. Norfolk Aggie, Hopedale, Nipmuc, Blackstone-Millville and BVT left the TVL with the creation of the Dual Valley Conference (DVC). After the creation of the DVC the TVL was left with only seven members. Ashland and Westwood wanted out of the Dual County League and gained TVL membership in the early 1970s. In 2002, Norton was readmitted, as the 10th member. In 2017 Dedham joined the TVL as the 11th member.[13] Norwood became the league's 12th member a year later.

The 12 schools that currently comprise the league are Ashland, Bellingham, Dedham, Dover-Sherborn, Holliston, Hopkinton, Medfield, Medway, Millis, Norton, Norwood, and Westwood.[14]

Some or all of the schools in the league compete in the following sports:[15]

• Ricky Santos, Bellingham, Football[16]
• Kenny Florian, Dover-Sherborn, Soccer
• Keegan Bradley, Hopkinton, Golf
• Jon Curran, Hopkinton, Golf
• Mark Sweeney, Holliston, Baseball
• Kara Wolters, Holliston, Basketball
• Uzo Aduba, Medfield, Track
• Steve Berthiaume, Medfield, Cross Country
• Jay Brosnan, Medway, Lacrosse
• Jackie MacMullan, Westwood, Basketball
• Matthew Boldy, Medway/Holliston, Hockey