• Oklahoma City
  • Changge City

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.

Changge City, which belongs to Xuchang City, Henan Province, is a county-level city under Xuchang's jurisdiction; it is adjacent to Xuchang City-Jian'an District to the south, Zhengzhou Airport area to the north and Xinzheng International Airport to the north, between latitude 34 °20km north and longitude 113o 34km east. It has a total area of 650square kilometers and a resident population of 679300 (2016). It has jurisdiction over 4 streets and 12 towns. Changge City has two industrial agglomeration zones (Changge Economic and technological Development Zone and Changge Dazhou Industrial agglomeration Zone). By 2015, Changge City has built 10 national and provincial enterprise technology centers and 2 postdoctoral workstations. GE, head of China's top 100 industrial counties, ranked 54th in 2017. The main business income of industry in 2016 is 215.8 billion, the first in Henan county.
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