Oakland Activities Association is a Southeast Michigan high school athletics conference.
After its first year, the OAA experienced rapid growth, with Pontiac Central from the Saginaw Valley Association and Oak Park from the Suburban Athletic League joining in 1995, and Auburn Hills Avondale, Clawson, Madsion Heights Lamphere, and Madison Heights Madison all coming to the OAA in 1996 after the disbandment of the Macomb-Oakland Athletic Conference.
2002 also marked a period of decline for the OAA, beginning with Brandon High leaving to join the Flint Metro League that year, where it currently resides.
[1] However, the OAA has been beginning to fill these holes in their membership, extending an invitation to Ferndale University in 2020, who had been co-oping with Ferndale for football for years, and extending another invitation to their first non-Oakland County school in Harper Woods, who was previously an independent, in 2021.
There have also been a significant amount of closings and consolidations of various Oakland County schools in recent years, which also has not helped the OAA's membership.