Between 1995 and 2013, the same five people, all Republican, held seats in the Board of Supervisors: Greg Cox, Bill Horn, Diane Jacob, Ron Roberts, and Pam Slater-Price.

[3] In 2018, Nathan Fletcher defeated former San Diego County District Attorney Bonnie Dumanis to take Ron Roberts' seat, returning a Democrat to the Board of Supervisors.

[7] [8][9] Nora Vargas was re-elected to another term in November 2024, but on December 20, she announced that she will not be taking the oath of office in January 2025 "due to personal safety and security reasons.

A special election to fill Vargas' seat is scheduled for April 8, 2025, with a runoff on July 1 if no candidate wins a majority of the votes.

[14] In accordance with Article II, Section 6 of the Constitution of California, members of the San Diego County Board of Supervisors are officially nonpartisan.