1968-69: Pella Christian leaves to become an independent. Hedrick, Fremont, and Blakesburg leave to help form the Empire Conference. Tri-County, Deep River-Millersburg?? Conference disbands.

1962-63: What Cheer consolidates with Thornburg, Gibson, and Keswick to form Tri-County. The new school remains in the league. Deep River-Millersburg joins. Membership increases to 6.

1961-62: Pella Christian and Blakesburg join. Eddyville leaves. Membership increases to 5. 

1960-61: Earliest known lineup is Eddyville, Hedrick, Fremont, What Cheer. Membership is 4.

1956-57: Eddyville is a member.

same in 1936-37

1934-35:Earliest known lineup is New Sharon, Eddyville, Fremont, Cedar, Lacey, and Tracy. Membership is 6.