Colorado Springs is the most populous city in El Paso County, Colorado, United States, and its county seat. The population of 478,961 at the 2020 census, a 15.02% increase since 2010. Colorado Springs is the second-most populous city and most extensive city in the state of Colorado, and the 39th-most-populous city in the United States. It is the principal city of the Colorado Springs metropolitan area, which had 755,105 residents in 2020, and the second-most prominent city of the Front Range Urban Corridor.