New Hampshire elected its members August 18, 1820.
| District | Incumbent | This race | |||
|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | |
| New Hampshire at-large 6 seats on ageneral ticket | Josiah Butler | Democratic-Republican | 1816 | Incumbent re-elected. | √William Plumer Jr. (Democratic-Republican) 16.6% √Nathaniel Upham (Democratic-Republican) 16.5% √Josiah Butler (Democratic-Republican) 16.2% √Matthew Harvey (Democratic-Republican) 14.9% √Aaron Matson (Democratic-Republican) 14.2% √Thomas Whipple Jr. (Democratic-Republican) 10.6% Arthur Livermore (Democratic-Republican) 5.9% Levi Jackson (Federalist) 2.7% Clifton Clagett (Democratic-Republican) 2.2% |
| Nathaniel Upham | Democratic-Republican | 1816 | Incumbent re-elected. | ||
| Clifton Clagett | Democratic-Republican | 1802 1804 (Retired) 1816 | Incumbent lost re-election. New member elected. Democratic-Republican hold. | ||
| Joseph Buffum Jr. | Democratic-Republican | 1819 | Incumbent retired. New member elected. Democratic-Republican hold. | ||
| William Plumer Jr. | Democratic-Republican | 1819 | Incumbent re-elected. | ||
| Arthur Livermore | Democratic-Republican | 1816 | Incumbent lost re-election. New member elected. Democratic-Republican hold. | ||
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