• San Francisco
  • Lüchun 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.

Luchun County is under the jurisdiction of Honghe Prefecture. Formerly known as "six villages", when the county was founded in 1958, Zhou Enlai personally named it Lvchun according to the characteristics of "green mountains and green waters, like spring all the year round". Luchun County is located in the south of Yunnan Province, in the southwest of Honghe Prefecture, bordering Yuanyang and Jinping counties in the east, Honghe County in the north, Mojiang County in the northwest, Lixianjiang County and Jiangcheng County in the southwest, and the Socialist Republic of Vietnam in the southeast. It is 312 kilometers away from the estuary border port and 132 kilometers away from the Jinshui River port. The provincial highway S214 passes through the county seat. By the end of 2012, Luchun County covers an area of 3096 square kilometers and has jurisdiction over one town and eight townships; the registered population is 233249, and the population of ethnic minorities is 230161, accounting for 98.7% of the registered population.
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