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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.

Cao County is a county under the jurisdiction of Heze City, Shandong Province, known as Cao Zhou in ancient times, located in the southwest of Shandong Province, at the junction of eight counties of Shandong and Henan provinces, Shangqiu and Civil Rights to the south, Heze and Dingtao to the north, Shan County and Chengwu to the east, Dongming and Lankao to the west; with a total area of 1969 square kilometers, it has jurisdiction over 5 subdistrict offices, 22 townships and a total population of 1694064 in 2017. Ming Hongwu four years (1371), Caozhou down to Caoxian, after the restoration of Caozhou, Caoxian this name is still in use today. He has won honors such as "hometown of asparagus in China", "hometown of paulownia processing in China", "top 100 counties in China's food industry", "advanced counties in plain greening in China", and the first batch of large-scale cloned cattle experimental bases in China. In history, a number of outstanding figures emerged successively, such as Yi Yin, prime minister of the Shang Dynasty, Wu Qi, a strategist in the warring States period, and Han Dynasty agronomist Kui Shengzhi.
Airport In Caoxian county - Heze Peony Airport
Heze Mudan Airport (Heze Mudan Airport, IATA: HZA, ICAO: ZSHZ), referred to as "Mudan Airport", is located near Huangzhuang Village, Menghai Town, Dingtao District, Heze City, Shandong Province, China, about 25 kilometers away from the center of Heze in the northwest. 4C level domestic feeder airport   .
On January 24, 2018, Heze Civil Airport was named "Heze Mudan Airport"; on August 19, 2020, the place name code of Heze Mudan Airport was approved   ; On January 18, 2021, the test flight of Heze Mudan Airport was successful   ; On April 2, 2021, Heze Mudan Airport officially opens   .
As of April 2021, the terminal building of Heze Mudan Airport has an area of ​​10,916 square meters, with 4 boarding bridges; 9 C-class seats on the civil aviation station; the runway is 2,600 meters long and 45 meters wide; it can meet the annual passenger throughput 900,000 passengers, 6,500 tons of cargo and mail throughput, and 9,184 aircraft takeoffs and landings   .
In 2021, Heze Mudan Airport will handle a total of 367,081 passengers, ranking 152nd in the country; cargo and mail throughput of 25.5 tons, ranking 203rd in the country; 3,600 aircraft movements, ranking 183rd in the country   .
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