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San Francisco, officially the City and County of San Francisco, is the leading financial and cultural center of Northern California and the San Francisco Bay Area.

The only consolidated city-county in California, it encompasses a land area of about 46.9 square miles (121 square kilometers) on the northern end of the San Francisco Peninsula, giving it a density of about 17,179 people per square mile (6632 people per kilometers). It is the most densely populated 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 and the seventeenth most populous city in the United States, with a population of 815,201 as of the 2021 Census. The city is also the financial and cultural hub of the larger San Jose-San Francisco-Oakland metropolitan area, with a population of 7.8 million.

Counties of California
San Diego County, San Francisco, San Joaquin County
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