• San Francisco
  • Tongchuan District

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.

Tongchuan District, which belongs to Dazhou City, Sichuan Province, is located in the northeast of Sichuan Province and in the middle of Dazhou City, adjacent to Xuanhan County in the northeast, Dachuan District in the southwest and Pingchang County in the northwest. As of October 2018, Tongchuan District has jurisdiction over 19 townships and 3 subdistrict offices, covering an area of 900square kilometers and a resident population of 782100. It is a national advanced area of scientific and technological progress, a national demonstration area of harmonious community construction, a national demonstration base of agricultural products processing industry, an advanced area of safe construction, an advanced area of hilly areas, and a demonstration area of rural tourism. Tongchuan District, which was established in 1999 as the seat of the state and government, is the political, economic and cultural center of Dazhou City. The four leading groups of the Municipal Party Committee, the Municipal Government, the Municipal people's Congress, the Municipal people's political Consultative Conference and the major administrative departments are all located in Tongchuan, which is known as "the heart of Dazhou".
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