San Francisco, officially known as the City and County of San Francisco, is a major city located in California. It ranks as the fourth-most populous city in the state and the 17th-most populous city in the United States, with a population of 826,079 as of 2025.
The city holds significant economic rankings among U.S. cities with populations over 200,000, ranking first by per capita income and third by population density as of 2024. Its metropolitan statistical area is the 13th-largest in the United States, while the broader San Jose–San Francisco–Oakland combined statistical area ranks as the fifth-largest in the country.