Its eleven member institutions are located in the Midwestern United States in the states of Michigan, Illinois, Indiana, and Wisconsin.

There are three affiliate members who compete in the GLIAC for sports not sponsored by their home conference.

Sponsorship of football was dropped by the GLIAC after the 1989 season.

The GLIAC currently has 11 full members; all but two are public schools.

The GLIAC currently has three affiliate members, all but one are private schools: The GLIAC had 13 former full members; all but one are private schools: The GLIAC had nine former affiliate members, all were private schools.