Rapid City (Lakota: Mni Lúzahaŋ Otȟúŋwahe; "Swift Water City '') is the second most populous city in South Dakota and the county seat of Pennington County. Named after Rapid Creek, on which the city is established, it is set against the eastern slope of the Black Hills mountain range. The population was 67,956 as of the 2010 Census.
what county is rapid city south dakota in
Pennington County