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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.

Jiashan County, which is under the jurisdiction of Jiaxing City, Zhejiang Province, is located in the northeast of Jiaxing City and at the confluence of Jiangsu, Zhejiang and Shanghai provinces and cities. It is adjacent to Qingpu and Jinshan districts of Shanghai to the east, Pinghu City and Nanhu District of Jiaxing City to the south, Xiuzhou District of Jiaxing City to the west, Wujiang District of Suzhou City of Jiangsu Province and Qingpu District of Shanghai to the north. Located in the core area of the Yangtze River Delta urban agglomeration, Zhejiang Province is the first stop in line with Shanghai, is one of the top 100 counties in the country, and is the only national named "county scientific development demonstration site". In 2017, Jiashan County was selected as the key city of PPP innovation in the field of major municipal engineering, and Jiashan County became the only selected city in the province. The total area of the county is 507.68 square kilometers (the number of county land is detailed), of which water accounts for 14.29%. 2017 Jia
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