• San Francisco
  • Haiyan County

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.

Haiyan County, which belongs to Jiaxing City, Zhejiang Province, is one of the earliest established counties in Zhejiang Province, founded in Qin. Haiyan County is located in the northwest of Hangzhou Bay, 118 kilometers away from Shanghai and 98 kilometers away from Hangzhou. It has jurisdiction over 4 streets and 5 towns, with a land area of 534.73 square kilometers and an estuarine bay area of 537.90 square kilometers. In the sixth national census in 2010, the resident population of the county was 430900. Sea salt is known as "the land of fish and rice, the house of silk, the land of etiquette, the place of tourism". It was listed as a coastal economic open zone by the State Council in 1985 and is one of the top 100 counties with comprehensive strength in China. In November 2018, he was selected into the top 100 industrial counties (cities) in 2018. In December 2018, it was selected as one of the top 100 county economic investment potential in China. The quality and safety of the second batch of national agricultural products
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