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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.

Zengdu District is located in northern Hubei, east of Wuhan, west of Sichuan and Shaanxi, north of the Central Plains, south of Jingxiang, known as "Jingyu to Chong", "Han Xiang throat", "the important town of northern Hubei". They all used to be called "the hometown of chimes". Zengdu District, located in the hinterland of Suizhou, Hubei Province, is the resident of Suizhou municipal government at the prefectural level. Zengdu District has four distinct seasons, hot summers and cold winters, and its Leigudun Scenic spot is a famous scenic spot. Zengdu District covers an area of 1316 square kilometers, accounting for 19% of the original Zengdu District. In 2017, the total population was 820000, accounting for 40% of the former Zengdu district, of which the agricultural population was 530000, accounting for 65% of the total population, and the urban population was 290000, accounting for 37% of the total population. It has jurisdiction over 5 towns, 4 offices, Chengnan New area Management Committee and Economic Development Zone Management Committee, 154 villages and 48 neighborhood committees.
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