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.

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In Carl Manino's flashback from Sue Ellen Chickens Out it shows the Sugar Bowl when Carl was in his teen years. A teenage dog was wearing an orange, white and black jock jacket that said "ECHS" on the back of it, and a football under it. We can safely assume that this stands for "Elwood City High School" and that Catherine and her friends, including Angie and Debbie, attend it with her.