There are 75 state legislative seats up for election this year in Oregon. Across those, 14 incumbents (six Democrats, seven Republicans, and one Independent) did not file to run for re-election. That’s just over the average number of retirements since Ballotpedia began tracking this data in 2010 (13.9). In 2022, 24 incumbents did not run for re-election (15 Democrats and 9 Republicans).

Eleven incumbents out of 61 running will face primary challengers this year. That is the most since 2010 and the highest percentage of incumbents in contested primaries during that span (18%). The next closest year, both in terms of number and percent of incumbents contested, was 2022 with nine incumbents (17.6% of 51) running in contested primaries. 

The total number of contested primaries (with more than one candidate) was 27 (12 Democratic and 15 Republican). That is higher than the average number of contested primaries from 2010-2022 (23.9), and the third-highest year overall after 2022 (37) and 2020 (33). This means 18% of possible primaries in Oregon this year are contested, the third-highest figure since 2010. The year with the highest percentage of contested primaries was 2022 (24.7%), followed by 2020 (22.0%). 

Oregon has a Democratic trifecta, meaning the Democratic party controls the governorship and both chambers of the state legislature. As of May 16, 2024, there are 23 Republican trifectas, 17 Democratic trifectas, and 10 divided governments where neither party holds trifecta control.