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San Francisco (/sæn frənˈsɪskoʊ/), officially the City and County of San 
Francisco, is the cultural, commercial, and financial center of Northern 
California and the only consolidated city-county in California. San 
Francisco encompasses a land area of about 46.9 square miles (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 18,187 people 
per square mile (7,022 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.