What Is The Population Of California 2024 By County. The most populous counties in california are los angeles county with 9,663,345, san diego county at 3,269,973, orange county with 3,135,755, riverside county. San bernardino county, california 's estimated 2024 population is 2,196,314 with a growth rate of 0.03% in the past year according to the most recent united states census data.

There are 58 counties in california. According to the latest results from the contra costa county registrar’s office, bernal, a former city manager for antioch, is poised to be the next mayor in this contentious.