Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since 2010. Colorado Springs is the second-most populous city and the most extensive city in the state of Colorado, and the 40th-most populous city in the United States. It is the principal city of the Colorado Springs metropolitan area and the second-most prominent city of the Front Range Urban Corridor. It is located in east-central Colorado, on Fountain Creek, 70 miles (113 km) south of Denver.
Luochuan County is located in the middle of Shaanxi Province in China. In the south of Yan'an. (longitude 109 °13 "14"-109 °45 "47" east, latitude 35 °26 "29"-36 °04 "12" north. The county covers an area of 1886 square kilometers, with a resident population of 229600 (2016), mainly of the Han nationality. Qin and Han Zhiyi County, Wei and Jin Xiongnu entered the occupation, and the first eight years after the establishment of Qinyao County (393), Luochuan County was located in the north of Xianxian County, which got its name from Luoshui County. After several relocation, the name of the county is still in use today. In March 2019, it was listed as the first batch of revolutionary cultural relics protection and utilization district and county list.