[5] Following the death of Dianne Feinstein on September 29, 2023, incumbent Democratic senator Laphonza Butler was appointed to the seat by Governor Gavin Newsom.

[15] All of California's 52 seats to the United States House of Representatives will be up for election to two-year terms.

A special election was held for California's 20th congressional district on March 19, 2024, following the resignation of Kevin McCarthy.

State legislator Vince Fong won the May 21 runoff, defeating Tulare County sheriff Mike Boudreaux.

10 senators are term-limited in 2024, while Democrat Dave Min is retiring early to run for Congress.