How is the county board of supervisors elected?
California counties have five supervisors elected for four-year staggered terms on a nonpartisan ballot, except for the city-county of San Francisco, which has 11 supervisors and a mayor. If a supervisorial position becomes vacant between elections, it is filled by the governor in general law counties. Charter counties may make other provisions for filling vacancies. In all counties, supervisorial district boundaries must be adjusted after each federal census so that the population of all districts is as nearly equal as possible.
