What Is The Population Of California 2024 In Billion. Since joining the us in 1850 amid a gold rush, california has become the most populous in the country. The most populous cities in california are los angeles with 3,820,914, san diego at.

At the last official united states census carried out in 2020, the population of california was declared at 39,538,223. The most populous cities in california are los angeles with 3,820,914, san diego at.