Looking at the ‘Top 15’ school districts in Pennsylvania (based on PSSA results), Allegheny County continues as the number one county with six school districts represented followed by Chester County with three school districts (Unionville Chadds Ford, Great Valley and T/E), Delaware County with three school districts (Radnor, Wallingford Swarthmore and Rose Tree Media) and Montgomery County with one school district (Lower Merion).