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  • Pingchuan District

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.

Pingchuan District is a municipal district under the jurisdiction of Baiyin City, Gansu Province, which is located in the north of the middle of Baiyin City, Gansu Province. The general characteristics of the topography of Pingchuan District are high in the southeast and low in the northwest, tilting from the southeast to the northwest. The total area is 2106 square kilometers and the population is 209000 (2016). Pingchuan District has jurisdiction over 4 streets, 4 towns and 3 townships. Pingchuan is an important coal and electricity energy base in Gansu, with an annual output of more than 12 million tons of high-quality raw coal and 13 billion kilowatt-hours of electricity generation. Pingchuan is the largest ceramic production base in northwest China, with clay reserves of more than 4 billion tons and annual output of nearly 20 million square meters of wall and floor tiles. Pingchuan has been awarded "China Ceramic Industry transfer demonstration Base" by China Ceramic Industry Association. In 2009, Pingchuan District won the title of Advanced Zone of Scientific and technological Progress in China. In 2016, Pingchuan District achieved regional health throughout the year.
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