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Facts about San Francisco, CA
San Francisco, officially the City and County of San Francisco and colloquially known as SF, San Fran, Frisco, or The City, is the cultural, commercial, and financial center of Northern California. San Francisco is the 15th most populous city in the United States, and the fourth most populous in California, with 883,305 residents as of 2018. It covers an area of about 46.89 square miles (121.4 km2), mostly at the north end of the San Francisco Peninsula in the San Francisco Bay Area, making it the second most densely populated large U.S. city, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. San Francisco is the 12th-largest metropolitan statistical area in the United States by population, with 4.7 million people, and the 4th-largest by economic output, with GDP of $549 billion in 2018.
The U.S. Census Bureau estimates San Francisco's population to be 883,305 as of July 1, 2018, with a population density of 18,838/sq mi. With roughly one-quarter the population density of Manhattan, San Francisco is the second-most densely populated large American city, behind only New York City among cities greater than 200,000 population, and the fifth-most densely populated U.S. county, following only four of the five New York City boroughs.