PITTSBURGH — Somewhere within Pennsylvania’s 46,000 square miles lies the answer of who will be president for the next four years: President Trump, or Joe Biden? The Keystone State is home to 67 counties, each with distinctive economies, cultures, populations, and traditions, all of which affect their voting patterns.

Elected officials across the state have cautioned voters and the media that the winner of Pennsylvania’s 20 electoral votes almost certainly won’t be known on Tuesday night, especially because they won’t start counting mail ballots until the morning of Election Day. An overwhelming majority of votes are expected to be counted by Friday.