Member of Congress Katherine Lauren "Katie" Hill (Democratic), who was first elected in 2018 announced her resignation on 27 October 2019 effective 1 November 2019: "It is with a broken heart that today I announce my resignation from Congress. This is the hardest thing I have ever had to do, but I believe it is the best thing for my constituents, my community, and our country."

14 November 2019: Governor Gavin Newsom (Democratic) called a 3 March 2020 Special Primary Election to fill the vacant seat in Los Angeles and Ventura counties. All candidates, both party members and independents, participate in a non-partisan 3 March 2020 Special Primary. If one candidate receives a majority (50% + 1) of the primary vote, that candidate is elected. Otherwise, the top two vote getters, regardless of party, advance to a 12 May 2020 Special General Election. The In-Lieu Petitions are due 10 December 2019 and the Declaration of Candidacy is due 9 January 2020. The winner will serve the remainder of the term which ends in January 2021.

Congressional District 25, Special Primary Election from the California Secretary of State.

3 March 2020: Sine no one received a majority on 3 March, the top two vote getters, state Assemblywoman Christy Smith 35% and Michael "Mike" Garcia 26%, will advance to a 12 May 2020 Special General Election.

18 March 2020: Due to the COVID-19 virus, there is a possibility of conducting the 12 May runoff exclusively by mail. All registered voters already receive ballots by mail however vote centers are available.

12 May 2020 returns from the California Secretary of State.

12 May 2020: Michael "Mike" Garcia is elected in a Special Election.

29 December 2019: Member of Member of Congress John R. Lewis announced he has stage 4 pancreatic cancer.
9 June 2020: Member of Congress John R. Lewis is renominated by primary.
17 July 2020: Member of Congress John R. Lewis passed away from from pancreatic cancer at the age of 80. He was first elected in 1986.

18 July 2020: The Democratic Executive Committee will select a replacement nominee on Monday 20 July and submit that name to the Secretary of State by no later than 4:00 pm. Out of a group of 131 applicants, the nominating committee selected Park Cannon, Andre Dickens, Robert Franklin, Nikema Williams, and James "Major" Woodall for consideration by the Executive Committee.

20 July 2020: After a nonbinding poll of 41 votes, Nikema Williams 37, Park Cannon 2, James "Major" Woodall 1, and abstention. With 50% + 1 majority, the Executive Committee nominated Nikema Williams.

27 July 2020: Governor Brian Porter Kemp (Republican) called a Special Election to fill the vacant seat of Member of Congress John R. Lewis (Democratic) who passed away on 17 July 2020. All candidates (regardless of party affiliation) will run on a single ballot on 29 September 2020. If one candidate receives more than 50% of the vote, that candidate is elected. Otherwise, the top two vote-getters advance to a 1 December 2020 runoff. The Special Election is for the remainder of the term ending in January 2021. The filing deadline is 31 July 2020.

29 September 2020: Since no one received a majority of the vote in the nonpartisan special election, the top two vote-getters advance to a 1 December 2020 runoff.

1 December 2020: former Atlanta City Councilman Kwanza Hall (Democratic) won the runoff. He will fill the seat for the remainder of the term ending in January 2021.