United States Senate elections, 1804 and 1805

Dates vary by state

11 of the 34 seats in the United States Senate (plus special elections)
18 seats needed for a majority

	Majority party	Minority party

Party	Democratic-Republican	Federalist
Last election	22 seats	9 seats
Seats before	25	9
Seats won	9	2
Seats after	27	7
Seat change	2	2
Seats up	7	4

Majority party before election

Democratic-Republican

Elected Majority party

Democratic-Republican

The United States Senate elections of 1804 and 1805 were elections that expanded the Democratic-Republican Party's overwhelming control over the United States Senate. The Federalists went into the elections with such a small share of Senate seats (9 out of 34, or 27%) that even if they had won every election, they would have still remained a minority caucus.

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

Senate Party Division, 9th Congress (1805–1807)

In these special elections, the winner was seated during 1804 or before March 4, 1805; ordered by election date.

In these general elections, the winner was seated on March 4, 1805; ordered by state.

All of the elections involved the Class 2 seats.

In this special election, the winner was seated in 1805 after March 4.

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