• San Francisco
  • Hongan 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.

Hong'an, formerly known as Huang'an, is located at the southern foot of the Dabie Mountains in the northeast of Hubei Province, facing Wuhan to the south, Henan to the north, Macheng to the east, Huangpi and Dawu to the west. The county seat is 80 kilometers away from the provincial capital Wuhan and is about an hour's drive. It is an important part of Wuhan city circle. Hong'an County has a total land area of 1796 square kilometers and has jurisdiction over 12 townships and 396administrative villages. In 2017, Hong'an County has a total population of 700000, including 559000 in rural areas and 134600 in cities and towns. Hong'an is a typical agricultural county in mountainous areas, a key county in the new round of national poverty alleviation and development work, and a pilot county for the construction of old base areas across the country. Hong'an, with beautiful mountains and rivers and outstanding people, once nurtured the founder of Neo-Confucianism, famous philosophers Cheng Hao and Cheng Yi in the Northern Song Dynasty, and the "Tiantai Sangeng" (Geng Ying and Geng Ding) in the Ming Dynasty.
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