California Population 2025 Graph Projections. By 2025, california’s population is projected to reach a staggering 42.5 million, according to estimates. This is a line chart displaying the growth of california's population from the 1900 census to 2025.

San benito county—6 percent increase in population; Benchmarked on the 2020 decennial census count data, our latest round of national population projections provides a look into the demographic future (total population,.