Rapid City is a city in South Dakota, United States, and the county seat of Pennington County. It is the second most populous city in the state, a…Rapid City is a city in South Dakota, United States, and the county seat of Pennington County. 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.
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