Pierre is the capital city of the U.S. state of South Dakota and the seat of Hughes County. The population was 14,091 at the 2020 census, mak…Pierre is the capital city of the U.S. state of South Dakota and the seat of Hughes County. The population was 14,091 at the 2020 census, making it the second-least populous U.S. state capital. It is South Dakota's ninth-most populous city. Pierre is the principal city of the Pierre micropolitan area, which includes all of Hughes and Stanley counties.
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