The state congressional district map was redrawn by the Supreme Court of Pennsylvania in February 2018 after ruling the previous map unconstitutional due to partisan gerrymandering; the previous 1st district was geographically succeeded by the newly redrawn 2nd district which on November 6, 2018, elected Brendan Boyle, the incumbent from the 13th district.

[4] It is the wealthiest congressional district in the state of Pennsylvania.

Only minor changes were made to the district after redistricting following the 2020 census.

The district was reorganized in 1803 to have 3 at-large seats on a general ticket.

The district was apportioned a fourth seat in 1813, also elected on a general ticket.