1918 United States Senate election in South Dakota

1918 United States Senate election in South Dakota

November 5, 1918
 
Nominee Thomas Sterling Orville V. Rinehart W. T. Rafferty
Party Republican Democratic Independent
Popular vote 51,198 36,210 5,560
Percentage 55.07% 38.95% 5.98%

County results
Sterling:      40–50%      50–60%      60–70%      70–80%
Rinehart:      40–50%      50–60%      60–70%      70–80%
No Vote:      

U.S. senator before election

Thomas Sterling
Republican

Elected U.S. Senator

Thomas Sterling
Republican

The 1918 United States Senate election in South Dakota took place on November 5, 1918. Incumbent Republican Senator Thomas Sterling sought re-election in his first popular election. He defeated former Governor Frank M. Byrne in the Republican primary and then faced former State Representative Orville Rinehart, the 1916 Democratic nominee for Governor, in the general election. Sterling defeated Rinehart, along with independent candidate W. T. Rafferty, by a wide margin to win re-election.