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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.

Qu County, which belongs to Dazhou City, Sichuan Province, is located in the southwest of Dazhou City, and is connected with Guang'an, Nanchong and Bazhong landscapes. The geographical coordinates are between 106 °38 miles east longitude and 107 degrees 15 miles east, and 31 degrees 16 degrees north latitude. Quxian is located in the transitional zone between the parallel ridges and valleys in eastern Sichuan and the purple hilly region in central Sichuan, which belongs to the subtropical monsoon climate, with a total area of 2013 square kilometers. As of 2018, qu County has jurisdiction over 60 townships, with a registered population of 1.3438 million and a resident population of 1.1161 million. Qu County had human activities as early as the Neolithic Age. During the Yin and Shang dynasties, the Shang people established the national capital city in Chengba Village, Tuxi Town. In the first year of King Zhou (314 BC), Dangqu County was set up, and qu County was named in the ninth year of Hongwu in the Ming Dynasty (1376). It also built a county.
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