With a Cook Partisan Voting Index rating of D+39, it is the most Democratic district in Pennsylvania.

[1] Prior to 2018, the district was located in the northwestern part of the state and included the cities of Erie, Sharon, Hermitage, Butler and Meadville.

The Supreme Court of Pennsylvania redrew this district in February 2018 after ruling the previous map unconstitutional.

In 2020, the district gave Joe Biden 91 percent of the vote, his best showing in the nation.

This version of the 3rd supported President George W. Bush in 2004 as well as John McCain in 2008, Mitt Romney in 2012 and Donald Trump in 2016.