The 1904 United States presidential election in South Dakota took place on November 8, 1904. All contemporary 45 states were part of the 1904 United States presidential election. Voters chose four electors to the Electoral College, which selected the president and vice president. South Dakota was won by the Republican nominees, incumbent President Theodore Roosevelt of New York and his running mate Charles W. Fairbanks of Indiana. The ticket won the state by a margin of 49.42%.