What Is The Population Of California 2024 In Millions. By far the most populous state in the united states is california, which has more than 40 million residents and comprises nearly 12% of the country’s total population. The population of california in 2020 was 39,503,200, a 0.17% increase from 2019.

By far the most populous state in the united states is california, which has more than 40 million residents and comprises nearly 12% of the country’s total population. California’s population increased in 2023 for the first time in three years.