| Year: | 1804 |
| Type: | Presidential election year |
| Incumbent President: | Thomas Jefferson (Democratic-Republican) |
| Next Congress: | 9th |
| President Control: | Democratic-Republican hold |
| President Candidate1: | Thomas Jefferson (DR) |
| Electoral Vote1: | 162 |
| President Candidate2: | Charles C. Pinckney (F) |
| Electoral Vote2: | 14 |
| President Map Caption: | 1804 presidential election results. Green denotes states won by Jefferson, burnt orange denotes states won by Pinckney. Numbers indicate the number of electoral votes allotted to each state. |
| Senate Control: | Democratic-Republican hold |
| Senate Seats Contested: | 11 of 34 seats[1] |
| Senate Net Change: | Democratic-Republican +2[2] |
| House Control: | Democratic-Republican hold |
| House Seats Contested: | All 142 voting members |
| House Net Change: | Democratic-Republican +11 |
| Governor Seats Contested: | 13 |
| Governor Net Change: | +1 Federalist |
| Governor Map Caption: | 1804 gubernatorial election results |
The 1804 United States elections elected the members of the 9th United States Congress. The election took place during the First Party System. The Democratic-Republican Party continued its control of the presidency and both houses of Congress.
In the presidential election, incumbent Democratic-Republican President Thomas Jefferson easily defeated Federalist former Governor Charles Pinckney of South Carolina.[3] As the Twelfth Amendment had been ratified in 1804, this was the first election in which electors separately selected a president and a vice president.
In the House, Democratic-Republicans won moderate gains, boosting their already-dominant majority.[4]
In the Senate, Democratic-Republicans made small gains, improving on their commanding majority.[5]