Located on the West Coast of the United States at the north end of the San Francisco Peninsula, San Francisco includes significant stretches of the Pacific Ocean and San Francisco Bay within its boundaries. There are more than 50 hills within the city limits, and some neighborhoods are named after the hill on which they are situated. The nearby San Andreas and Hayward Faults are responsible for much earthquake activity, although neither physically passes through the city itself. Although it is only the 15th-most populous city in the United States with almost 900,000 residents as of 2018, is the second most densely populated large U.S. city.
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