of 23 seats. Pennsylvania was re-districted into 15 districts, one with 4 seats, five with 2, and the remaining nine with 1 seat each. There were seven open seats for this election, five resulting from the increase in apportionment, and two resulting from the retirement of incumbents. Its elections were held October 13, 1812. |- ! rowspan=4 | | Adam Seybert | | Democratic-Republican | 1809 | Incumbent re-elected. | rowspan=4 nowrap | |- | William Anderson | | Democratic-Republican | 1808 | Incumbent re-elected. |- | James Milnor | | Federalist | 1810 | | Incumbent retired.New member elected.Democratic-Republican gain. |- | colspan=3 | None (Seat created) | | New seat.New member elected.Democratic-Republican gain. |- ! rowspan=2 | | Roger Davis | | Democratic-Republican | 1810 | Incumbent re-elected. | rowspan=2 nowrap | |- | Jonathan Roberts | | Democratic-Republican | 1810 | Incumbent re-elected. |- ! rowspan=2 | | Joseph Lefever | | Democratic-Republican | 1810 | | Incumbent retired.New member elected.Democratic-Republican hold.Successor later resigned, leading to a special election. | rowspan=2 nowrap | |- | colspan=3 | None (Seat created) | | New seat.New member elected.Federalist gain.Successor later resigned, leading to a special election. |- ! | colspan=3 | None (Seat created) | | New seat.New member elected.Democratic-Republican gain. | nowrap | |- ! rowspan=2 | | Robert Whitehill | | Democratic-Republican | 1805 | Incumbent re-elected. | rowspan=2 nowrap | |- | William Crawford | | Democratic-Republican | 1808 | Incumbent re-elected. |- ! rowspan=2 | | Robert Brown | | Democratic-Republican | 1798 | Incumbent re-elected. | rowspan=2 nowrap | |- | William Rodman | | Democratic-Republican | 1810 | | Incumbent lost re-election.New member elected.Democratic-Republican hold. |- ! | John M. Hyneman | | Democratic-Republican | 1810 | Incumbent re-elected. | nowrap | |- ! | William Piper | | Democratic-Republican | 1810 | Incumbent re-elected. | nowrap | |- ! | David Bard | | Democratic-Republican | 1802 | Incumbent re-elected. | nowrap | |- ! rowspan=2 | | George Smith | | Democratic-Republican | 1808 | | Incumbent lost re-election.New member elected.Democratic-Republican hold. | rowspan=2 nowrap | |- | colspan=3 | None (Seat created) | | New seat.New member elected.Democratic-Republican gain. |- ! | William Findley | | Democratic-Republican | 1802 | Incumbent re-elected. | nowrap | |- ! | Aaron Lyle | | Democratic-Republican | 1808 | Incumbent re-elected. | nowrap