| District | Incumbent | Party | First
elected | Result | name="m1" | Unless otherwise noted, only candidates with at least 1% of the vote listed. |
|---|
| MD|1|X}} | John Campbell | Federalist | 1801 | Incumbent re-elected. | √ John Campbell (Federalist) 99.6% |
| MD|2|X}} | Walter Bowie | Democratic-Republican | 1802 (special) | Incumbent retired.
New member elected.
Democratic-Republican hold. | √ Leonard Covington (Democratic-Republican) 52.0%
Archibald Van Horne (Democratic-Republican) 46.8%
Clement Hill (Federalist) 1.1% |
| MD|3|X}} | Thomas Plater | Federalist | 1801 | Incumbent lost re-election.
New member elected.
Democratic-Republican gain. | √ Patrick Magruder (Democratic-Republican) 56.0%
Thomas Plater (Federalist) 44.0% |
| MD|4|X}} | Daniel Hiester | Democratic-Republican | 1788 (Pennsylvania)
1796 (Resigned)
1801 (Maryland) | Incumbent died March 7, 1804.
New member elected.
Democratic-Republican hold.
Successor was also elected on the same day to finish the current term, see above. | √ Roger Nelson (Democratic-Republican) 98.5%
Eli Williams (Federalist) 0.8%
Scattering 0.7%[1] |
{{ushr|MD|5|X}}
{{Small|Plural district with 2 seats}} | Nicholas R. Moore | Democratic-Republican | 1803 | Incumbent re-elected. | √ Nicholas R. Moore (Democratic-Republican) 50.9%
√ William McCreery (Democratic-Republican) 46.3%
Robert Goodloe Harper (Federalist) 1.8%
Others 1.0% |
| William McCreery | Democratic-Republican | 1803 | Incumbent re-elected. |
| MD|6|X}} | John Archer | Democratic-Republican | 1801 | Incumbent re-elected. | √ John Archer (Democratic-Republican)
Unopposed |
| MD|7|X}} | Joseph H. Nicholson | Democratic-Republican | 1798 (Special) | Incumbent re-elected. | √ Joseph H. Nicholson (Democratic-Republican) 99.6% |
| MD|8|X}} | John Dennis | Federalist | 1796 | Incumbent retired.
New member elected.
Federalist hold. | √ Charles Goldsborough (Federalist) 56.6%
Henry Waggaman (Democratic-Republican) 43.4% |
1. ^{{cite web | title=Maryland 1804 U.S. House of Representatives, District 4 | url=https://elections.lib.tufts.edu/catalog/tufts:md.uscongress4.1804 | access-date=September 21, 2018 | publisher= Tufts University | work= Tufts Digital Collations and Archives | series= A New Nation Votes: American Election Returns 1787–1825 }}
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