1818 and 1819 United States Senate elections

The 1818 and 1819 United States Senate elections were elections for the United States Senate that had the Democratic-Republican Party gain two seats. The Federalists had only three seats being contested, of which they lost two and the third was left vacant due to a failure to elect.

As these elections were prior to ratification of the seventeenth amendment, Senators were chosen by state legislatures.

Results summary
Senate Party Division, 16th Congress (1819–1821)


 * Majority Party: Democratic-Republican (30–37)
 * Minority Party: Federalist (9)
 * Vacant: 3–0
 * Total Seats: 42–46

Before the elections
After the admission of Illinois.

Special elections during the 15th Congress
In these special elections, the winners were seated during 1818 or before March 4, 1819; ordered by election date.

Races leading to the 16th Congress
In these general elections, the winner was seated on March 4, 1819 (except where noted due to late election); ordered by state.

All of the elections involved the Class 3 seats.

Special elections during the 16th Congress
In these special elections, the winners were seated in 1819 after March 4; ordered by election date. The new Congress was seated December 6, 1819, so some of these late-elected senators were seated after that.