Rapid City, South Dakota From Wikipedia, the free encyclopedia Jump to: navigation, search City of Rapid City Mni Luzahan Otowan City Downtown Rapid City Location in Pennington County and the state of South Dakota Coordinates: 44°04′34″N 103°13′41″W / 44.076°N 103.228°W / 44.076; -103.228Coordinates: 44°04′34″N 103°13′41″W / 44.076°N 103.228°W / ..