In which country is the city of San Francisco located?

San Francisco is a United States city, the fourth-largest in California by population (after Los Angeles, San Diego, and San Jose), with an estimated 2019 population of 881,549, placing it the twelfth most populous city in the United States and the second-most densely populated, behind New York City.

The city is part of a vast metropolitan area (about 7 million inhabitants, the fifth-largest in the country), the San Francisco Bay Area, of which it has always been the economic, financial, cultural, and tourist center, although it has now lost its primacy in population. It is a popular destination for many international tourists and is known for its cool summer fog, its steep hills, its cultural vibrancy, and its architectural eclecticism—a blend of Victorian and modern architecture—for its famous landmarks, including the Golden Gate Bridge, its cable cars, Alcatraz Island, and Chinatown. The local branch of the University of California is one of the world's leading biomedical centers, and the hospital is among the largest in the United States.

It is also home to five major banking institutions and various other companies such as Levis, Gap, Fitbit, Salesforce.com, Dropbox, Reddit, Square Inc., Dolby, Airbnb, Weebly, Pacific Gas and Electric Company, Yelp, Pinterest, Twitter, Uber, Lyft, Mozilla, the Wikimedia Foundation, and Craigslist.