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  • Baota 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.

Baota District, known as Yanzhou in ancient times, is located in the northern Shaanxi Province and the hilly and gully region of the Loess Plateau in northern Shaanxi. It is known as "Qin important area" and "plugged throat". The Xia Dynasty belonged to Yongzhou, it was successively under the jurisdiction of Di, Jin, Wei and Qin in the Spring and Autumn and warring States period, and it was established in the Han Dynasty, Yanzhou or Yan'an House in the Sui and Tang dynasties, and Fushi after the Song Dynasty. After the Republic of China, it was renamed Yan'an County. In 1937, the Central Committee of the Communist Party of China entered Yan'an and established Yan'an City, which is the seat of the government of the Shaanxi-Gansu-Ningxia Border region. In December 1996, Yan'an withdrew to set up the city, and Yan'an was renamed Baota District. It is the seat of the Yan'an Municipal Party Committee and Municipal Government, and it is the central city of Yan'an. The total land area of the region is 3556 square kilometers, with a registered population of 481200 (2017) and a resident population of 491800 (2017). It has jurisdiction over 9 towns, 4 townships and 5 cities.
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