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  • Suzhou、Soochow

San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

Suzhou, referred to as "Su" in ancient times, is an important part of the prefecture-level cities under the jurisdiction of Jiangsu Province and the Yangtze River urban agglomeration. Approved by the State Council, it is one of the national historical and cultural cities and scenic tourism cities, the national high-tech industrial base and one of the important central cities in the Yangtze River Delta. By 2018, the city had jurisdiction over five districts and four county-level cities in escrow, with a total area of 8488.42 square kilometers, a built-up area of 461.65 square kilometers, a resident population of 10.7217 million, and an urban population of 8.1539 million, with a urbanization rate of 76.05%. Suzhou is located in the southeast of Jiangsu Province and the middle of the Yangtze River Delta, facing Shanghai to the east, Jiaxing to the south, Taihu Lake to the west and the Yangtze River to the north, longitude 119 °55 to the east, 121 °20 to the north, latitude 3.
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