San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Holy person Francis"), authoritatively the City and County of San Francisco, is a social, business, and monetary focus in the U.S. province of California. Situated in Northern California, San Francisco is the seventeenth most crowded city in the United States, and the fourth generally crowded in California, with 873,965 occupants as of 2020.[15] It covers a space of about 46.9 square miles (121 square kilometers),[20] for the most part at the north finish of the San Francisco Peninsula in the San Francisco Bay Area, making it the second most thickly populated enormous U.S. city, and the fifth most thickly populated U.S. district, behind just four of the five New York City precincts. San Francisco is the twelfth biggest metropolitan measurable region in the United States with 4.7 million inhabitants, and the fourth-biggest by monetary yield, with a GDP of $592 billion in 2019.[21] With San Jose, California, it shapes the San Jose–San Francisco–Oakland, CA Combined Statistical Area, the fifth most crowded joined factual region in the United States, with 9.6 million occupants starting at 2019. Everyday epithets for San Francisco incorporate SF, San Fran, The City, and Frisco.

In 2019, San Francisco was the district with the seventh-most noteworthy pay in the United States, with a for each capita pay of $139,405.[24] around the same time, San Francisco appropriate had a GDP of $203.5 billion, and a GDP for every capita of $230,829.[21][25] The San Jose–San Francisco–Oakland, CA Combined Statistical Area, with a GDP of $1.09 trillion starting at 2019, is the country's third-biggest economy.[26] Of the 105 essential factual regions in the U.S. with more than 500,000 occupants, this CSA had the most elevated GDP per capita in 2019, at $112,348.[26] San Francisco was positioned twelfth on the planet and second in the United States on the Global Financial Centers Index as of March 2021.[27]

San Francisco was established on June 29, 1776, when homesteaders from Spain set up the Presidio of San Francisco at the Golden Gate and Mission San Francisco de Asís a couple of miles away, both named for Francis of Assisi.[3] The California Gold Rush of 1849 brought fast development, making it the biggest city on the West Coast at that point. San Francisco turned into a combined city-district in 1856.[28] San Francisco's status as the West Coast's biggest city topped somewhere in the range of 1870 and 1900, when around 25% of California's populace dwelled in the city proper.[29] After 3/4 of the city was obliterated by the 1906 quake and fire,[30] San Francisco was rapidly reconstructed, facilitating the Panama-Pacific International Exposition nine years after the fact. In World War II, San Francisco was a significant port of embarkation for administration individuals dispatching out to the Pacific Theater.[31] It then, at that point turned into the origin of the United Nations in 1945.[32][33][34] After the conflict, the juncture of returning servicemen, huge migration, changing perspectives, alongside the ascent of the "nonconformist" and "flower child" nonconformities, the Sexual Revolution, the Peace Movement developing from resistance to United States association in the Vietnam War, and different variables prompted the Summer of Love and the gay rights development, solidifying San Francisco as a focal point of liberal activism in the United States. Strategically, the city casts a ballot unequivocally along liberal Democratic Party lines.

A mainstream vacationer destination,[35] San Francisco is known for its cool summers, mist, steep moving slopes, mixed blend of engineering, and milestones, including the Golden Gate Bridge, trolleys, the previous Alcatraz Federal Penitentiary, Fisherman's Wharf, and its Chinatown region. San Francisco is additionally the base camp of organizations like Twitter, Square, Airbnb, Levi Strauss and Co., Gap Inc., Salesforce, Dropbox, Pacific Gas and Electric Company, Uber, and Lyft. The city, and the encompassing Bay Area, is a worldwide focal point of technical studies and arts[36][37] and is home to various instructive and social foundations, like the University of California, San Francisco (UCSF), the University of San Francisco (USF), San Francisco State University (SFSU), the de Young Museum, the San Francisco Museum of Modern Art, the SFJAZZ Center, and the California Academy of Sciences