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.
Yangquan City, a prefecture-level city under the jurisdiction of Shanxi Province, was called "Yangquan" in ancient times. Located in the central and eastern part of Shanxi Province, adjacent to Xinzhou City in the north, Taihang Mountain and Shijiazhuang City in the east, Taiyuan City in the west and Jinzhong City in the south; with a total area of 4559 square kilometers, it is a new industrial city. Yangquan is located in the eastern edge of the Loess Plateau, belongs to the eastern mountains of Shanxi, the landforms in the territory are mainly mountains, the rest are hills and plains; it belongs to the warm temperate semi-humid continental monsoon climate zone. As of 2018, Yangquan City has jurisdiction over three districts and two counties, with a total population of 1.4144 million. Yangquan is the gateway of Sanjin, Shanxi and Hebei, located in the middle of the two provincial capitals of Taiyuan and Shijiazhuang, with a distance of 100 kilometers. Yangquan is also located in the combination zone of the eastern developed region and the central and western regions, as well as the two major scriptures around the Bohai Sea and the Yangtze River Delta.