List of United States presidential elections by Electoral College margin

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In United States presidential elections, citizens who are registered to vote cast ballots for members of the Electoral College, who then cast electoral votes for president and vice president.^[1][2] In order to be elected to office, a candidate must win an absolute majority of electoral votes. Since the Twenty-third Amendment gave citizens residing in the District of Columbia the right to vote, this has meant winning at least 270 of the 538 electoral votes.^[3]

Since the Twelfth Amendment in 1804, electors have cast separate votes for the president and vice president. Previously, each elector cast two votes for president, and the winner and runner-up became president and vice president, respectively.^[4]