1964 United States presidential election in South Dakota

The 1964 United States presidential election in South Dakota took place on November 3, 1964, as part of the 1964 United States presidential election. Voters chose four representatives, or electors, to the Electoral College, who voted for president and vice president.

South Dakota was won by incumbent President Lyndon B. Johnson (D–Texas), with 55.61 percent of the popular vote, against Senator Barry Goldwater (R–Arizona), with 44.39% of the popular vote. As of the 2024 presidential election, this is the last time South Dakota was carried by the Democratic nominee (although they nearly did so in 1976 for Jimmy Carter), as well as the last time a Democrat won Pennington, Lincoln, Meade , Yankton, Custer , Bennett, Clark, Hamlin, Hand, Hyde, Jackson, Jones , Lyman, Mellette , Potter, Stanley , Tripp, and Walworth Counties.