As of May 4, 2,850 major party candidates have filed to run for the Senate and House of Representatives in 2020.

So far, 420 candidates are filed with the Federal Election Commission (FEC) to run for U.S. Senate in 2020. Of those, 341—175 Democrats and 166 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.

For U.S. House, 2,801 candidates are filed with the FEC to run in 2020. Of those, 2,509—1,184 Democrats and 1,325 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.

Thirty-six members of the U.S. House are not seeking re-election in 2020. That includes 27 Republicans and nine Democrats. Four senators (three Republicans and one Democrat) are not running for re-election. In 2018, 55 total members of Congress—18 Democrats and 37 Republicans—did not seek re-election.

In addition, nine incumbent members of the 116th Congress have left office early—eight representatives and one senator. Six Republicans and two Democrats left the House before the end of their terms. Sen. Johnny Isakson (R-Ga.) resigned in December 2019.

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, Democrats currently hold a majority with 232 seats.