1798–99 United States Senate elections

The 1798–99 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1798 and 1799, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 2.

They occurred in the middle of President John Adams's administration, and had no net change in political control of the Senate.

Results summary
Senate party division, 6th Congress (1799–1801)


 * Majority party: Federalist (22)
 * Minority party: Democratic-Republican (9)
 * Other parties: 0
 * Total seats: 31

Before the elections
After the January 19, 1798, election in Delaware.

Race summaries
Except if/when noted, the number following candidates is the whole number vote(s), not a percentage.

Special elections during the 5th Congress
In these special elections, the winner was seated before March 4, 1799; ordered by election date.

Races leading to the 6th Congress
In these regular elections, the winner was seated on March 4, 1799; ordered by state.

All of the elections involved the Class 2 seats.

Special elections during the 6th Congress
In this special election, the winner was seated after March 4, 1799, the beginning of the next Congress.