Introduction
San Francisco [key], city (2020 pop. 873,965), coextensive with San Francisco co., W Calif., on the tip of a peninsula between the Pacific Ocean and San Francisco Bay, which are connected by the strait known as the Golden Gate; inc. 1850. The city is the heart of the San Francisco Bay region and with Oakland and San Jose comprises the 12th largest metropolitan area in the United States with 4.7 million residents as of the 2020 census; it is the 4th largest in terms of economic output.
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