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.
Luonan County, located in the southeast of Shaanxi Province, belongs to Shangluo City. Located in the south of Huashan, Huayang Pool is set up in Zhou and Huayang County is located in Qin Dynasty. It is 108 kilometers away from Xi'an. It is adjacent to Lushi and Lingbao in Henan to the east, Danfeng and Shangzhou to the south, Huazhou and Lantian to the west, Huayin and Tongguan to the north, and is known as Shaanxi's "southeast gateway". It is the only Yellow River valley county in Shangluo City and the "top ten gold medal walnut counties" in China. The forest coverage rate is above 90%. Luonan is the hometown of Chinese character culture, and the word Shengcangjie created the characters here, so Luonan is one of the birthplaces of Chinese civilization. On August 4, 2018, the Fifth Plenary session of the fourth Shangluo Municipal Committee of the Communist Party of China discussed and deliberated the opinions on abolishing the establishment of Huayang District in Luonan County. This work is being submitted to the State Council for approval in accordance with the procedures, which means that Luonan County will withdraw in the future.