Two teams, Fenton and Swartz Creek, joined from the County B League, and one each from the Big Nine Conference (Ainsworth), Wayne-Oakland League (Holly) and Tri-County League (Lapeer High) and a new high school: Carman.
Clio in 2005 and Swartz Creek in 2006 moved to the Flint Metro League as the conference was perceived as being overpowering to those schools.
[1] In 2006, the entire Big Nine Conference applied for membership in the league to encourage discussion on a merger.
[2] In 2014, Flushing Schools joined the Flint Metro League from the Saginaw Valley Conference, replacing Lapeer East and West, which merged into Lapeer High and left the FML,[3] while in 2017, Owosso High School joined the FML after leaving the Capital Area Activities Conference.
In 2019, three members of the Genesee Area Conference left that conference to join the Flint Metro League, expanding the league to twelve teams and two divisions.