What Is California Population 2024. What is the fastest growing city in california? San diego county has a population of 3,337,685 and a growth rate of 7.8%, while neighboring orange county has 3,190,400 residents and a growth rate of 6%.
Los angeles is the biggest city in california, with a population of 3,795,936 in 2024. California population 2024 (demographics, maps, graphs) 38,889,770.