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 is notable for its high economic indicators; as of 2024, it ranked first by per capita income among U.S. cities with populations over 200,000 and sixth in aggregate income. It also ranks third in population density within that same category. The San Francisco metropolitan statistical area has approximately 4.6 million residents, while the broader San Jose–San Francisco–Oakland combined statistical area houses roughly 9.2 million people.