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District 10 of the Pennsylvania Interscholastic Athletic Association (PIAA) is an interscholastic athletic association in Northwest Pennsylvania. District 10 is one of the PIAA's 12 athletic conferences and comprises high schools in Erie, Pennsylvania and surrounding counties to the south and east. Member schools are classified by enrollment into four categories based on the number of students: A, AA, AAA, AAAA. District 10 is commonly referred to as "D-10" and is sometimes notated with the Roman Numeral "X".