Most of the population in the old 7th district became part of a new 5th district, encompassing all of Delaware County and parts of South Philadelphia; while most of the old 15th district became the new 7th district.
The population shift in the old 7th and 15th districts resulted in a reorganization of electoral boundaries, with parts of the old 7th district becoming the new 5th district and the old 15th district being absorbed into the new 7th district.