New Hampshire gained one seat after the 1810 census. Its elections were held August 31, 1812.
| District | Incumbent | This race | |||
|---|---|---|---|---|---|
| Representative | Party | First elected | Results | Candidates | |
| New Hampshire at-large 6 seats on ageneral ticket | Josiah Bartlett Jr. | Democratic-Republican | 1810 | Incumbent retired. New member elected. Federalist gain. | √Roger Vose (Federalist) 9.0% √Daniel Webster (Federalist) 9.0% √Bradbury Cilley (Federalist) 9.0% √William Hale (Federalist) 9.0% √Samuel Smith (Federalist) 9.0% √Jeduthun Wilcox (Federalist) 8.9% David Morrill (Democratic-Republican) 7.7% John Parrott (Democratic-Republican) 7.7% Samuel Dinsmoor (Democratic-Republican) 7.7% John Adams Harper (Democratic-Republican) 7.7% Jesse Johnson (Democratic-Republican) 7.7% Josiah Butler (Democratic-Republican) 7.6% |
| 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. | ||
| None (Seat created) | New seat. New member elected. Federalist gain. | ||||
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