• Oklahoma City
  • Lankao 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.

Lankao, a county under the jurisdiction of Kaifeng City, Henan Province, and Zhiguan County, Henan Province, is located at the last bend of the Jiuqu Yellow River, with a total area of 1116 square kilometers and a total population of 859100. It is an important part of "half-hour traffic circle" in "one pole, two circles and three layers" in Henan Province. Lankao County was a household in the Spring and Autumn period, and Jiyang County was the beginning of Lankao County in the Qin Dynasty. In 5 BC, Emperor Liu Xiu, Emperor of the Han Dynasty, was born in the Jiyang Palace in the north of the county. In 9 years, it was changed from Dongfen County to Dongming County. In 1218, Dongming County was abandoned as Tongan Castle, and the new county seat was moved to the old land of Yuanggu County in the north of the Yellow River. In 1232, the south of the Yellow River was divided into two counties: Lanyang County and Yifeng County. In March 1783, the county seat of Kaocheng County moved to Lankao County for the first time. In 1825, Yifeng County was merged into Lanyang County, known as "Lanyi County".
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