In the past week, three members of Congress announced 2020 retirements: Reps. Denny Heck (D-Wash.), Tom Graves (R-Ga.), and George Holding (R-N.C.). To date, four Senators (three Republicans and one Democrat) and 31 Representatives (22 Republicans and nine Democrats) are not running for re-election. In 2018, 55 members of Congress—18 Democrats and 37 Republicans—did not seek re-election.

As of December 9, 2019, 308 candidates are filed with the Federal Elections Commission (FEC) to run for U.S. Senate in 2020. Of those, 265—141 Democrats and 124 Republicans—are from one of the two major political parties. In 2018, 527 candidates filed with the FEC to run for U.S. Senate, including 137 Democrats and 240 Republicans.

1,923 candidates are filed with the FEC to run for U.S. House in 2020. Of those, 1,802—895 Democrats and 907 Republicans—are from one of the two major political parties. In 2018, 3,244 candidates filed with the FEC, including 1,566 Democrats and 1,155 Republicans.

On November 3, 2020, 35 Senate seats and all 435 House seats are up for election. Of those Senate seats, 33 are regularly-scheduled elections, while the other two are special elections in Arizona and Georgia. Twelve are Democratic-held seats and 23 are Republican-held seats. In the House, where all the seats are up for election, Democrats currently hold a 233-seat majority.

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