2016 United States presidential election in Pennsylvania

The 2016 United States presidential election in Pennsylvania took place on November 8, 2016, as part of the 2016 United States elections in which all 50 states and the District of Columbia participated. Pennsylvania voters chose electors to represent them in the Electoral College via a popular vote.

On April 26, 2016, in the presidential primaries, voters selected the Democratic, Republican, and Green parties' respective nominees for president. Pennsylvania is a closed primary state, meaning voters must have been previously registered with a particular political party in order to vote for one of that parties' candidates, to participate in their respective party primary.

In the general election, Donald Trump, the Republican nominee, won Pennsylvania by 44,292 votes out of more than 6 million cast, a margin of 0.72% and the narrowest margin in a presidential election since 1840, when William Henry Harrison defeated Martin Van Buren by just 0.12%. Pennsylvania voted 2.82% more Republican than the nation-at-large, marking the first time since 1948 that Pennsylvania voted to the right of the nation.

Prior to the election, Pennsylvania was expected to be close as polling showed the results within the margin of error, but many election experts viewed that Clinton had an edge. However, on Election Day, Pennsylvania unexpectedly swung to Donald Trump. Trump carried 56 of the state's 67 counties, predominantly rural or suburban counties, while Clinton carried much of the Philadelphia metropolitan area as well as other cities including Pittsburgh, Harrisburg and Scranton. Nonetheless, some areas of traditional Democratic strength such as Luzerne County, where Wilkes-Barre is located, saw swings in margins of up to 25% toward Donald Trump, making him the first Republican nominee for president to win Pennsylvania since George H. W. Bush in 1988.