The 1856 United States presidential election in Pennsylvania took place on November 4, 1856, as part of the 1856 United States presidential election. Voters chose 27 representatives, or electors to the Electoral College, who voted for president and vice president.
Pennsylvania voted for the Democratic candidate, James Buchanan, over the Republican candidate, John C. Frémont, and the Know Nothing candidate, Millard Fillmore. Buchanan won Pennsylvania by a margin of 18.12%.
Following the election, Pennsylvania woud establish itself as a Republican stronghold. This would be the final time that the Keystone would vote for a Democratic candidate until Franklin D. Roosevelt won the state in 1936.