• Oklahoma City
  • Tianquan 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.

Tianquan County, which belongs to Ya'an City, Sichuan Province, is located on the western edge of Sichuan Basin, at the eastern foot of Erlang Mountain, the upper reaches of Qingyi River, and the Sichuan-Tibet Highway (National Highway 318) runs through the whole territory. The average annual rainfall is 1735.6 mm. The average annual sunshine is 860.2 hours and the frost-free period is 241days. Tianquan County has jurisdiction over 15 townships, with a total area of 2400 square kilometers. The county seat is 180 kilometers away from Chengdu and 38 kilometers away from Ya'an. In 2012, Tianquan County has a total population of 150000. In 2013, Tianquan County achieved a GDP of 4.197 billion yuan, an increase of 3.9% over 2012. The per capita GDP was 27317 yuan, an increase of 3.3%. The industrial structure of the three times has been adjusted from 15.1 to 57.5 in 2012 from 15.1 to 58.7 to 57.5:
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