How often are senators elected?

US Senate

Elective system:President and Vice PresidentHouse of Representativessenate

The election of Senators to the US Senate

Electoral system

(Relative) majority voting in single-constituencies (federal state). The exact electoral legislation is up to the respective state, so in Lousiana and Georgia a runoff election of the best two applicants may be necessary.


  • About a third of the senators are re-elected every 2 years, so that the Senate can in principle work continuously.
  • Washington D.C. residents are not eligible to vote.

Number of MPs

The Senate consists of 100 seats, two from each state (regardless of its size).

In addition, there is the Vice President, as President of the Senate, who, however, only has voting rights in the Senate if there is a tie.

Electoral term

The legislative period of a senator is six years and begins on January 3rd after the election (20th amendment to the Constitution). There is a new one every two years class newly elected by senators (approx. 1/3 of the Senate). The election itself takes place on the Tuesday after the first Monday in November in even years (Election day) (Constitution Article I, (4)), the legislative period begins on the following January 3rd (US Code).

Active and passive right to vote

Every American who does this is actively eligible to vote 18. Has reached the age of 16 and has his (main) residence in one of the 50 states - d. i.e., residents of Washington D.C., Puerto Rico, etc. are not eligible to vote.

All Americans who are at least 30 years old and at least 9 years of age are US citizens.