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Locator Map of South Dakota
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South Dakota (SD)

U.S. Senate Delegation

Joined the Union

November 2, 1889

Population (Est.)

919,818

Current U.S. Senators

Senior Senator
Mike Rounds

Mike Rounds

Republican
Class II Next Election: 2026
Junior Senator
John Thune

John Thune

Republican

Senate Majority Leader

Class III Next Election: 2028