Census data show San Franicsco’s population was up 0.62% in 2025, in contrast to statewide numbers that remained mostly flat. L.A. County recorded a 0.55% decrease.
Another tech center just south of San Francisco — Santa Clara County — saw its population rise 0.33%. In San Diego County, the population dropped 0.16%.
These two California counties have managed to increase their population without acquiring new land for construction.