Rapid City is the county seat of Pennington County, South Dakota, United States. It is the second-most populous city in the state, after Sioux Falls. It is located on the eastern slope of the Black Hills in western South Dakota and was named after Rapid Creek, where the settlement developed. The population was 74,703 as of the 2020 census. Known as the "Gateway to the Black Hills" and the "City of Presidents" because of the life-size bronze president statues downtown, Rapid City is split by a low mountain ridge that divides the city's western and eastern parts, called ‘The Gap.
https://en.wikipedia.org/wiki/Rapid_City,_South_Dakota