As of Feb. 15, 2024, 50 members of Congress—seven members of the U.S. Senate and 43 members of the U.S. House—announced they would not seek re-election in 2024.

Of the U.S. Senate members not running for re-election, six—U.S. Sens. Debbie Stabenow (D-Mich.), Ben Cardin (D-Md.), Tom Carper (D-Del.), Mitt Romney (R-Utah), Laphonza Butler (D-Calif.), and Joe Manchin (D-W. Va.)—announced their retirements from public office, while the other—U.S. Sen. Mike Braun (R-Ind.)—is running for governor of Indiana.

Of the 43 U.S. House members not seeking re-election:

13—four Republicans and nine Democrats—are running for the U.S. Senate. Two—one Democrat and one Republican—are running for state attorney general. Two—one Democrat and one Republican—are running for governor. One Democrat is running for President of the United States. 25—11 Democrats and 14 Republicans—are retiring from public office. As of February 15, 2022, 42 U.S. House members had announced they were not running for re-election. Thirty-five members had announced at this point in the 2020 cycle, and 44 had announced at this point in the 2018 cycle.

The seven U.S. Senators who have announced they are not running for re-election are one more than the six U.S. Senators who had announced their retirement at this point in the 2022 election cycle. Four had done so at this point in 2020, and three had done so at this point in the 2018 cycle.

Source: https://ballotpedia.org/List_of_U.S._Congress_incumbents_who_are_not_running_for_re-election_in_2024