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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.

Chengxiang District (Putian County, Xinghua Prefecture) is under the jurisdiction of Putian City, Fujian Province, also known as Licheng, located in the middle of the coast of Fujian Province, the urban center of Putian, the central part of Xinghua Plain, the west bank of the Taiwan Strait and Meizhou Bay in the south. Relying on the provincial capitals Fuzhou and Mawei in the north, Rongqiao Development Zone in the east and Meizhou Bay Development Zone in the east, it is a political, economic, cultural, educational, scientific and technological center and transportation hub of Putian City, covering an area of 509square kilometers. Chengxiang District is one of the coastal counties approved by the State Council in 1984. According to information in December 2016, Chengxiang District has jurisdiction over 3 streets and 4 towns, with a total population of 405496 in 2015. The city belongs to the south subtropical marine monsoon climate, with an annual average temperature of 20 ℃ and an annual average sunshine of 1947 hours. 2015, city compartment
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