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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.

Yitong Manchu Autonomous County, which belongs to Siping City, Jilin Province, is the only Manchu Autonomous County in Jilin Province. "Yitong" is a Manchu transliteration, derived from the name of Yitong River, which means "grand, surging river". Yitong Manchu Autonomous County is located in the middle of Jilin Province, the upper reaches of Yitong River, the south of the provincial capital Changchun, Shuangyang District of Changchun City in the east, Panshi City in the southeast, Dongfeng and Dongliao counties in the south, Lishu County in the southwest, Gongzhuling City in the southwest and the suburbs of Changchun in the north. The territory is 76 kilometers from east to west, 66 kilometers from north to south, and covers an area of 2523 square kilometers. It was first promoted to Yitong Prefecture in the eighth year of Guang Xu (1882) and Yitong Zhili Prefecture in the first year of Xuantong (1909). In 1913, the state was withdrawn and the county was established. On August 30, 1988, Yitong County was abolished and established.
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