Boldface (with superscript C) numbers indicate the majority Party in each house. Red (with superscript P) numbers (boldface or not) indicate the Party of the President in any event.
| President | Party | Congress | United States Senate | House of Representatives | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Republican | Federalist | other | vacancies | Republican | Federalist | other | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Adams, J. | Federalist | 6th 1799-1801 | 12 | 19CP | 1 | 43 | 63CP | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
6th CONGRESS- in General SENATE: 19 Federalists, 12 Republicans, 1 Law and Order 6th CONGRESS- United States SENATE The Senate of the 6th Congress included 1 Senator not elected to that body as a member of either of the two Major Parties, as follows:
Senator Henry Tazewell, a Republican, was re-elected by the General Assembly of the Commonwealth of VIRGINIA to the Class 2 seat (term: 4 March 1799 to 3 March 1805) from that State but died 24 January 1799 before the term to which he had been elected had even begun. His successor, Wilson Nicholas- also a Republican- was elected on 5 December 1799, before the end of the odd-numbered year in which the 6th Congress took office. However, as the late Senator Tazewell was the person actually intended to be elected to the seat in the original elections to the Senate by the legislatures of the several States during 1798/9, he is- therefore- counted among the 12 Republicans elected to the Senate of the 6th Congress, notwithstanding the existence of a vacancy at the start of that Congress [4 March 1799] due to Senator[-elect] Tazewell's death. 6th CONGRESS- HOUSE of Representatives
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Modified .