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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| Democrat | Republican | other | vacancies | Democrat | Republican | other | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reagan | Republican | 99th 1985-1987 | 47 | 53CP | 253C | 182P | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
99TH CONGRESS-SENATE General Election of 6 November 1984 elected 33 Class 2 Senate seats 99TH CONGRESS- HOUSE OF REPRESENTATIVES
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Modified .