List of United States senators from South Dakota

South Dakota was admitted to the Union on November 2, 1889, and elects U.S. senators to class 2 and class 3. Its current U.S. senators are Republicans John Thune and Mike Rounds. Karl E. Mundt is South Dakota's longest-serving senator. South Dakota is one of 15 states alongside California, Colorado, Georgia, Hawaii, Idaho, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Nevada, Pennsylvania, and Utah to have a younger senior senator and an older junior senator. South Dakota's class 3 seat also holds the distinction of having a future Senate Majority Leader defeat and succeed a former Majority Leader.

List of senators

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