• Oklahoma City
  • Qin'an 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.

Qin'an County, which belongs to Tianshui City, Gansu Province, is located in the southeast of Gansu Province, the north of Tianshui City, and the lower reaches of Hulu River, a tributary of Weihe River; the center is located at 34 °51 °N and 105 °40 °E, with a total area of 1601 square kilometers. As of 2015, Qinan County has jurisdiction over 12 towns and 5 townships. The total population is 618000 (2012). In 2015, the GDP of Qin'an County reached 5.26 billion yuan. Qinan County belongs to the temperate semi-humid climate in the south of Longzhong, with an annual average temperature of 10.4 ℃ and a normal annual precipitation of 507.3 mm. Qin'an County is one of the eighteen arid counties in Gansu Province, which belongs to the Liangfeng gully region in the west of Longzhong Loess Plateau with many mountains and few rivers. By 2015, Yangshao, Majiayao, Qijia Culture and other Neolithic cultural sites have been found in Qin'an County.
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