Delaware elected its members October 3, 1820.
| District | Incumbent | This race | ||||
|---|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | ||
| Louis McLane | Federalist | 1816 | Incumbent re-elected. | √ Caesar A. Rodney (Democratic-Republican) 26.9% √ Louis McLane (Federalist) 26.1% Willard Hall (Democratic-Republican) 23.5% John Mitchell (Federalist) 23.3% Others 0.2% | ||
| Willard Hall | Democratic-Republican | 1816 | Incumbent lost re-election. New member elected. Democratic-Republican hold. | |||