San Francisco, officially the City and County of San Francisco, is the cultural, commercial, and financial centre of Northern California and the only consolidated city-county in California. San Francisco encompasses a land area of about 121 km² on the northern end of the San Francisco Peninsula, which makes it the smallest county in the state. It has a density of about 7,124 people per km², making it the most densely settled large city (population greater than 200,000) in the state of California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United States-with a Census-estimated 2015 population of 864,816. The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB-designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.7 million.

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