Pennsylvania's first congressional district includes all of Bucks County and a sliver of Montgomery County in southeastern Pennsylvania. It has been represented by Brian Fitzpatrick since 2019. 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. The new first district is similar to the previous eighth district, with the new boundaries going into effect for the 2018 elections and representation thereafter. . It is the wealthiest congressional district in the state of Pennsylvania. Fitzpatrick, the incumbent from the previous 8th district, was elected on November 6, 2018, to the newly redrawn 1st district. Only minor changes were made to the district after redistricting following the 2020 census. It was one of 18 districts that would have voted for Joe Biden in the 2020 presidential election had they existed in their current configuration while being won or held by a Republican in 2022. The district is one of seven with a Cook Partisan Voting Index of EVEN, meaning that the district votes almost identically to the national electorate. Prior to 2018, the district had generally been based in Philadelphia.

Recent statewide election results

List of members representing the district

The district was organized from Pennsylvania's at-large congressional district in 1791.

1791–1793: one seat

1795–1803: one seat

The district was organized from Pennsylvania's at-large congressional district in 1795.

1803–1823: three seats, then four

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.

1823–present: one seat

The district was reorganized in 1823 to have one seat.

Recent election results

2012

2014

2016

2018

2020

2022