1986-87 - Founding Members (Athletic Director):
Eastern Connecticut State University (William "Bill" Holowaty)
University of Massachusetts Boston (Charlie Titus)
Plymouth State College, now University (John P. Clark & Eugene "Gene" Fahey)
Rhode Island College (William "Bill" Baird)
Southeastern Massachusetts University, now University of Massachusetts Dartmouth (Harry "Mickey" Connolly)
University of Southern Maine (Richard "Dick" Costello)
1993-94:
Full Member Addition
Western Connecticut State University (Edward "Ed" Farrington)
1997-98:
Full Member Addition
Keene State College (John Ratliff)
2000-01:
Affiliate Member Additions
Bridgewater State University (Field Hockey)
Fitchburg State University (Field Hockey)
Framingham State University (Field Hockey)
Salem State University (Field Hockey, Men's Lacrosse)
Westfield State University (Field Hockey)
Worcester State University (Field Hockey)
2003-04:
Affiliate Member Addition
Salem State (Men's Tennis)
2004-05:
Affiliate Member Additions
Bridgewater State University (Men's and Women's Tennis)
Salem State University (Women's Tennis)
2009-10:
Affiliate Member Additions
Worcester State University (Women's Tennis)
Bridgewater State University (Women's Swimming & Diving)
Westfield State University (Women's Swimming & Diving)
2014-15:
Affiliate Member Departure
Bridgewater State University (Women's Swimming & Diving)
2018-19:
Full Member Addition
Castleton University, now Vermont State University Castleton (Deanna Tyson)
2019-20:
Affiliate Member Addition
Massachusetts Maritime Academy (Men's Lacrosse)
2021-22:
Affiliate Member Addition
Bridgewater State University (Men's and Women's Swimming & Diving)
Western New England University (Women's Swimming & Diving)
Affiliate Member Departure
Worcester State University (Women's Tennis)
2022-23:
Affiliate Member Addition
University of New England University (Women's Swimming & Diving)
Affiliate Member Departures
Bridgewater State University (Field Hockey)
Fitchburg State University (Field Hockey)
Framingham State University (Field Hockey)
Salem State University (Field Hockey)
Westfield State University (Field Hockey)
Worcester State University (Field Hockey)
2024-25:
Affiliate Member Additions
Husson University (Men's and Women's Swimming & Diving)
Maine Maritime Academy (Men's and Women's Swimming & Diving)
SUNY Delhi (Men's and Women's Swimming & Diving)
2025-26:
Affiliate Member Additions
Babson College (Men's Ice Hockey)
Husson University (Women's Golf)
New England College (Men's and Women's Ice Hockey)
Norwich University (Men's and Women's Ice Hockey)
Westfield State University (Women's Golf)
Affiliate Member Departure
SUNY Delhi (Men's and Women's Swimming & Diving)
2026-27:
Affiliate Member Additions
Gordon College (Men's and Women's Swimming & Diving)
Lasell University (Women's Golf)
Worcester State University (Women's Golf)
Affiliate Member Departures
Massachusetts Maritime Academy (Men's Lacrosse, MASCAC begins sport sponsorship)
Salem State University (Men's Lacrosse, MASCAC begins sport sponsorship)
2027-28:
Affiliate Member Addition
Saint Anslem College (Men's and Women's Golf, Men's and Women's Ice Hockey)
Full Member Departure
Vermon State University Castleton