• San Francisco
  • Zhiduo County

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.

Zhiduo County is a county under the jurisdiction of Yushu Tibetan Autonomous Prefecture in Qinghai Province, which is located in the southwest of the province, the central and western part of the state border, and bordered by Xinjiang and Tibet Autonomous region in the west. The county government is stationed in Jiaji Borough (in Duocai Township). The county is bordered by Yushu County in the east, Hercynian escrow District in the west, Qumalai County and Haixi County in the north, and Zaduo County in the south. 921 kilometers away from the provincial capital Xining, 195 miles from the state capital, 109 National Highway and Qinghai-Tibet Railway pass through the waist. By the end of 2007, the total population of the county had reached 28200, mainly Tibetans, accounting for 97.8% of the total population, as well as Han, Hui, Qala and other ethnic groups. The total land area is 80200 square kilometers and it has jurisdiction over 6 townships. In 2007, the county's GDP reached 208.587 million yuan. On December 29th, 2018, Zhiduo County was killed.
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