Dublin School District (Third Class) Upper Merion Area School District (Second Class) Upper Moreland School District (Third Class) Upper Perkiomen School District (Third Class; also extends into Berks County) Wissahickon School District (Third Class) Chester County IU 24 Chester County Avon Grove School District (Third Class) Coatesville Area School District (Second Class) Downingtown Area School District (Third Class) Great Valley School District (Third Class) Kennett Consolidated School District (Third Class) Octorara Area School District (Third Class; also extends into Lancaster County) Owen J. Roberts School District (Third Class) Oxford Area School District (Third Class) Phoenixville Area School District (Third Class) Tredyffrin-Easttown School District (Second Class) Unionville-Chadds Ford School District (Third Class; also extends into Delaware County) West Chester Area School District (Second Class; also extends into Delaware County) Delaware County IU 25 Delaware County Chester-Upland School District (Second Class) Chichester School District (Third Class) Garnet Valley School District (Third Class) Haverford Township School District (Second Class) Interboro School District (Third Class) Marple Newtown School District (Second Class) Penn-Delco School District (Third Class) Radnor Township School District (Third Class) Ridley School District (Second Class) Rose Tree Media School District (Third Class) Southeast Delco School District (Second Class) Springfield School District (Second Class) Upper Darby School District (Second Class) Wallingford-Swarthmore School District (Third Class) William Penn School District (Second Class) Philadelphia IU 26 Philadelphia County Philadelphia City School District (First Class) Beaver Valley IU 27 Beaver County Aliquippa School District (Third Class) Ambridge Area School District (Third Class) Beaver Area School District (Third Class) Big Beaver Falls Area School District (Third Class) Blackhawk School District (Third Class; also extends into Lawrence County) Central Valley School District (Third Class) Freedom Area School District (Third Class) Hopewell Area School District (Third Class) Midland Borough School District (Third Class) New Brighton Area School District (Third Class) Riverside Beaver County School District (Third Class) Rochester Area School District (Third Class) South Side Area School District (Fourth Class) Western Beaver County School District (Third Class) Defunct Center Area School District ARIN IU 28 Armstrong County Apollo-Ridge School District (Third Class; also extends into Indiana County) Armstrong School District (Second Class; also extends into Indiana County) Freeport Area School District (Third Class; also extends into Butler County) Leechburg Area School District (Third Class; also extends into Westmoreland County) Indiana County Homer-Center School District (Third Class) Indiana Area School District (Third Class) Marion Center Area School District (Third Class)