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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.

Shuangbai County is a county under the jurisdiction of Chuxiong Autonomous Prefecture, Yunnan Province, built in the Western Han Dynasty, ancient Yizhou County, under the jurisdiction of Yimen, Shuangbai County and Xinping County in the northwest. It is located in the hinterland of central Yunnan, east of the Ailao Mountains, 58 kilometers away from Chuxiong, the state capital, and 210 kilometers away from Kunming, the capital of Yunnan. In 2011, Shuangbai County has jurisdiction over 5 towns, 3 townships, 84 village committees, 1540 villagers' groups and 1845 natural villages, with a total area of 4045 square kilometers. There is not a complete flat dam of one square kilometer in Shuangbai County, and the mountain area accounts for 99.7% of the land area. At the end of 2011, Shuangbai County has a total population of 159700, of which the agricultural population accounts for 89.2%. There are 18 ethnic groups living in the territory, including Han, Yi, Hui, Miao and Hani. In 2011, Shuangbai County realized 1.64 billion yuan of regional GDP and completed local wealth.
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