• Oklahoma City
  • Siping

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.

Siping, a prefecture-level city in Jilin Province, is located in the central hinterland of Songliao Plain and at the junction of Liao, Jilin and Mongolia provinces. Siping is an important transportation hub and logistics node city in Northeast China, which leads to the Yangtze River Delta and Beijing-Tianjin-Hebei in the eastern part of Jilin, Heilongjiang and Inner Mongolia. Siping has an area of 14323 square kilometers and a population of 3.204 million, including an urban area of 1100 square kilometers and a population of 625000. Siping has jurisdiction over Tiedong District, Tiexi District, Gongzhuling City, Shuangliao City, Lishu County and Yitong County. Siping has a long history, and the site of the ancient city of Yan on the bank of Erlong Lake, 50 kilometers away from the urban area, is the witness of the Han nationality's earliest development of Northeast China. History has left cultural monuments such as Hanzhou in Liao Dynasty, Xinzhou in Jin Dynasty and Yehe Tribe in Ming Dynasty. Daqingshan Village cultural sites, Yehe ancient city ruins, Liao and Jin dynasties
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