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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.

Kaiyuan City, Tieling City, Liaoning Province, under the jurisdiction of county-level cities, is located in the northeast of Liaoning Province, east of the middle reaches of Liao River, hilly area. As of 2014, Kaiyuan had jurisdiction over 3 streets, 11 towns and 6 townships. As of 2014, the total area of Kaiyuan City is 3164 square kilometers, and as of 2010, the total population of Kaiyuan City is 545600. Kaiyuan is an excellent tourist city in China and one of the birthplaces of Errenzhuan in Northeast China. With abundant rainfall and fertile land, Kaiyuan is a national key grain-producing area and commodity grain base. In 2011, Kaiyuan ranked 76th among the top 100 counties in the country, and ranked among the top 10 in the first national top 100 counties' satisfaction rating. "Ten reform and innovation demonstration counties and cities in China, ten most suitable counties and cities for entrepreneurship, ten counties and cities with the most core competitiveness" and "small and medium-sized cities in China"
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