data california 2024The 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 atCalifornia’s population has seen a snificant increase in 2025, nearly returning to pre-pandemic levels. According to the U.S. Census Bureau, the state’s population grew by approximately 233,000 residents this year,