California Population 2024 Projections By County. Usafacts uses census data to break down the population of california by race, age, and more. State of california, department of finance, demographic research unit, source file:.
California contains the second largest city (los angeles), 3 of the largest 10 cities (los angeles, san diego, and san jose), and the largest county (los angeles county) in the united states. 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 at.