| | Democratic-Republican | 1812 | | Incumbent lost re-election.New member elected.Federalist gain. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Democratic-Republican gain. | First ballot :James Parker (Democratic-Republican) 49.3%Thomas Rice (Federalist) 49.0%Others 1.7%Second ballot :nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Democratic-Republican gain. | nowrap | |} Mississippi Territory See Non-voting delegates, below. Missouri Territory See Non-voting delegates, below. New Hampshire New Hampshire gained one seat after the 1810 census. Its elections were held August 31, 1812. |- ! rowspan=6 | | Josiah Bartlett Jr. | | Democratic-Republican | 1810 | | Incumbent retired.New member elected.Federalist gain. | rowspan=6 nowrap | |- | Samuel Dinsmoor | | Democratic-Republican | 1810 | | Incumbent lost re-election.New member elected.Federalist gain. |- | Obed Hall | | Democratic-Republican | 1811 | | Incumbent retired.New member elected.Federalist gain. |- | John Adams Harper | | Democratic-Republican | 1811 | | Incumbent lost re-election.New member elected.Federalist gain. |- | George Sullivan | | Federalist | 1811 | | Incumbent retired.New member elected.Federalist hold. |- | colspan=3 | None (Seat created) | | New seat.New member elected.Federalist gain. |} New Jersey New Jersey kept its delegation at six seats but changed from electing its Representatives on a statewide general ticket to using three plural districts of two seats each. These districts were used only for the 1812 election, and These districts were used only for the 1812 electionThese districts were used only for the 1812 electionthe state returned to using a single at-large district in 1814. This was only the second time that New Jersey used districts (the first being in 1798). There was a statewide at-large election held in November 1812, that was invalidated: |- ! rowspan=2 | | Lewis Condict | | Democratic-Republican | 1810 | Incumbent re-elected. | rowspan=2 nowrap | |- | Adam Boyd | | Democratic-Republican | 18031804 1808 | | Incumbent lost re-election.New member elected.Democratic-Republican hold. |- ! rowspan=2 | | James Morgan | | Democratic-Republican | 1810 | | Incumbent lost re-election.New member elected.Federalist gain. | rowspan=2 nowrap | |- | George C. Maxwell | | Democratic-Republican | 1810 | | Incumbent lost re-election.New member elected.Federalist gain. |- ! rowspan=2 | | Thomas Newbold | | Democratic-Republican | 1806 | | Incumbent lost re-election.New member elected.Federalist gain. | rowspan=2 nowrap | |-