• San Francisco
  • Yuzhong 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.

Yuzhong County, under the jurisdiction of Lanzhou City, Gansu Province, is located in the central part of Gansu Province, near Qilihe and Chengguan District to the west, Anding District of Dingxi City to the east, Lintao County to the southwest, Pingchuan District of Baiyin City to the north, and Jingyuan County and Huining County to the northeast; it is high in the south and low in the middle, with a temperate continental climate, with a total area of 3301.64 square kilometers, and has jurisdiction over 8 towns and 15 townships. In 2017, there are 13 ethnic minorities with a registered population of 469083. Yuzhong County passes through the ancient Silk Road in three ways. Xinglong Mountain is a national 4A scenic spot and a national nature reserve. Qingcheng, an ancient town, is listed as a "national historical and cultural town" because of its historical and cultural relics and the ancient buildings of the Ming and Qing dynasties. The traffic in the county is more developed, such as Lanxin second Line, Lanyu Railway, Baolan passenger Special Railway, etc.
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