Elwood City High School

Elwood City High School is/was a high school that is located in Elwood City. Francine's sister, Catherine, probably attends this school.

Information
In Carl Manino's flashback from Sue Ellen Chickens Out it shows the Sugar Bowl when Carl was in his teen years. A teenager was wearing a jacket that said "ECHS" on the back of it. We can assume that this stands for "Elwood City High School" and that Catherine and her friends, including Angie and Debbie, go attend it along with her.