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.
A significant portion of the residents in the old 7th district were incorporated into the newly formed 5th district, which included all of Delaware County and portions of South Philadelphia. Conversely, most of the people from the old 15th district became part of the new 7th district.