1977 - Stockton State College (now Stockton University) joined the NJSAC, effective in the 1977-78 academic year.
1985 - Women's programs became part of the NJSAC, when the Jersey Athletic Conference (a women's sports athletic conference) was merged into the NJSAC. Therefore it was rebranded as the New Jersey Athletic Conference (NJAC), effective in the 1985-86 academic year.
2000 - The State University of New York at Cortland joined the NJAC as an associate member for football, effective in the 2000 fall season (2000-01 academic year).
2004 - New Jersey City left the NJAC to become an NCAA D-III Independent, effective after the 2003-04 academic year.
2004 - Western Connecticut State University joined the NJAC as an associate member for football, effective in the 2004 fall season (2004-05 academic year).
2005 - New Jersey City re-joined back to the NJAC after spending one season as an NCAA Division III Independent school, effective in the 2005-06 academic year.
2006 - Buffalo State College (now a university) joined the NJAC as an associate member for football, effective in the 2006 fall season (2006-07 academic year).
2012 - Buffalo State left the NJAC as an associate member for football, effective after the 2011 fall season (2011-12 academic year).
2013 - Western Connecticut State left the NJAC as an associate member for football, effective after the 2012 fall season (2012-13 academic year).
2014 - SUNY Brockport left the NJAC as an associate member for football, effective after the 2013 fall season (2013-14 academic year).
2014 - Southern Virginia University joined the NJAC as an associate member for football, effective in the 2014 fall season (2014-15 academic year).
2015 - SUNY Cortland and SUNY Morrisville left the NJAC as associate members for football, effective after the 2014 fall season (2014-15 academic year).
2019 - Frostburg State and Southern Virginia left the NJAC as associate members for football, effective after the 2018 fall season (2018-19 academic year).
2021 - Wesley (Del.) left the NJAC as an associate member for football after the school closed down to later be acquired by Delaware State University, effective after the 2020 fall season (2020-21 academic year).
2025 - Vermont State University–Castleton will join the NJAC as an associate member for football, effective in the 2025 fall season (2025-26 academic year).
2026 – SUNY New Paltz will join the NJAC as a full member, becoming the NJAC's first-ever full member located outside of the state of New Jersey.[1]
^New Jersey City left the NJAC after the 2003–04 school year to compete as an NCAA D-III Independent; which would later re-join back, effective in the 2005–06 school year.
^Southern Virginia left the NJAC to join the Old Dominion Athletic Conference after the 2018 football season (2018–19 school year), and would later become an all-sports member of the USA South Athletic Conference, effective in the 2021–22 school year.
^SUNY Brockport left the NJAC for the Empire 8 after the 2013 football season (2013–14 school year).
^ abSUNY Cortland and SUNY Morrisville left the NJAC to join the Empire 8 after the 2014 football season (2014–15 school year).