The 1864 United States presidential election in Ohio was held on November 8, 1864, as part of the 1864 United States presidential election. State voters chose 21 electors to the Electoral College, who voted for president and vice president.
Ohio was won by the National Union Party candidate, incumbent Republican President Abraham Lincoln and his running mate Andrew Johnson. They defeated the Democratic Party candidate, George B. McClellan and his running mate George H. Pendleton. Lincoln won the state by a margin of 12.74%.
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