At the time of publishing, about 7 million votes had been cast, with results showing the candidates neck and neck.
Here’s what we know about the Pennsylvania race so far.
When will Pennsylvania election results be called?
At the time of writing, 70 per cent of the votes have been counted.
Trump looks to be ahead at the moment, but there are a significant number of uncounted ballots in the metropolitan centres of Pittsburgh and Philadelphia, which may lean Democrat.
It’s not yet clear when the Associated Press will call the race.
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Why is Pennsylvania important?
To start with, it has 19 electoral college votes up for grabs.
It’s also a diverse state, with all sides of politics represented in its sizeable cities and regional areas.
That means that neither side could count it as theirs with any confidence before today.
It is also part of the so-called “Blue Wall” of states Harris likely needs to win to claim the White House, alongside Michigan and Wisconsin.
What are the Pennsylvania election result timings for Australia?
Polls closed several hours ago, with counting underway.
It’s getting close to midnight in the US, with the counting to continue through the afternoon in Australia (AEDT).
A result is likely hours but possibly days away.
Which way has Pennsylvania voted before?
Before going to Trump in 2016, Pennsylvania had been solidly Democrat since 1992.
In 2020, Joe Biden carried the state by the slimmest of margins, holding on with 50.01 per cent of the vote or a lead of about 80,500 votes.
When Trump won in 2016, he won by just 44,292 votes.