• Oklahoma City
  • Dingyuan County

Oklahoma City (/oʊkləˌhoʊmə -/ (listen)), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, it ranks 20th among United States cities in population, and is the 8th largest city in the Southern United States. The population grew following the 2010 census and reached 687,725 in the 2020 census. The Oklahoma City metropolitan area had a population of 1,396,445, and the Oklahoma City–Shawnee Combined Statistical Area had a population of 1,469,124, making it Oklahoma's largest municipality and metropolitan area by population.

Oklahoma City's city limits extend somewhat into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban tracts or protected rural zones (watershed). The city is the eighth-largest in the United States by area including consolidated city-counties; it is the second-largest, after Houston, not including consolidated cities. The city is also the second largest by area among state capital cities in the United States, after Juneau, Alaska.

Dingyuan County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, between latitude 32 °12'- 32 °42'N and longitude 117 °12'- 118 °5'E. it is located in the eastern part of Anhui Province, between the hinterland of eastern Anhui and the western part of the Yangtze River Delta, which is connected with Jiangsu, Zhejiang and Shanghai, covering an area of 2998 square kilometers and cultivated land of 2.469 million mu. By the end of 2017, Dingyuan County had a population of 974900 and had jurisdiction over 22 townships and 253 administrative villages. The topography of Dingyuan County is generally high in the north and low in the south. The landforms in the territory are divided into three types: hills, wavy plains and plains. In ancient times, it has the reputation of "Jinglian Bayi, Qutong nine provinces", and it is still the key point of China's north and south. The Beijing-Shanghai high-speed railway and the Huainan railway run through the territory, and the Beijing-Taiwan highway runs across the territory. Was listed as a country in 1987
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