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  • Zhidan 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.

Zhidan County, which belongs to Yan'an City, Shaanxi Province, is located in the hilly and gully region of the Loess Plateau in the north of Shaanxi Province, connected with Ansai in the east, Wuqi County and Jingbian County in the northwest, Ganquan County and Fuxian County in the southeast, and Heshui County and Huachi County in Gansu Province in the southwest. Between longitude 108o 11mm 56 "- 109o 3m 48" east and latitude 36o 21m 23 "- 37o 11m 47" north, with a total area of 3781 square km. Zhidan County, formerly known as Baoan County, was renamed Zhidan County in June of 1936 in memory of General Liu Zhidan, a "mass leader and national hero". In July of the 25th year of the people's Republic of China (1936), the Central people's Government of the Chinese Soviet Union held the capital Zhidan. The CPC Central Committee and Chairman Mao fought and lived here for more than six months, known as the Central Committee of the Communist Party of China.
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