The outcome of the US presidential election remains in the balance as a handful of battleground states complete their vote counts.

Democrat Joe Biden has racked up at least 253 of the 270 electoral votes that he needs, according to US network projections.

Fox News and The Associated Press have also called Arizona in his favour, which would give him 264.

Donald Trump has amassed 214 electoral votes so far, and is still in contention in several states that would afford the Republican incumbent a path to reelection.

Expected to report final vote counts at some point today are Georgia (16 electoral votes), North Carolina (15), and Nevada (6).

The potentially decisive state of Pennsylvania (20) may take a bit longer.

Mail-in ballots sent on or before election day in North Carolina can be counted until November 12.

Mr Biden could reach the magic number to gain the White House with a win in any of the three, if he keeps Arizona.

Mr Trump needs to capture all three to stay competitive.

Full results from 2020 US Election
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Here is a look at the situation in the key states that are still up for grabs, and paths to victory for each candidate:

Nevada - 6 Electoral College votes

Nevada, where Mr Biden is favoured, could put him precisely at the number needed to win, if he keeps Arizona. With more than 89% of the vote counted, Mr Biden was leading by fewer than 11,500 votes.

North Carolina - 15 Electoral College votes

In North Carolina, Mr Trump had a comfortable lead of around 77,000 votes with 95% of the ballots, about 5.38 million, tabulated.

The president is tipped to win the southeastern state, but mail-in ballots sent on or before election day in North Carolina can be counted until 12 November.

Georgia - 16 Electoral College votes

In Georgia, Mr Trump's razor-thin lead over Mr Biden has steadily slipped away and saw Mr Biden gain a slight lead, with about 98% counted.

The latest report from Edison Research has Mr Biden leading Mr Trump by 1,097 votes.

Mr Biden could pull in the lion's share of the final votes being counted, fewer than 19,000 remained as of Thursday evening, which include thousands in Democratic-leaning areas.

Georgia has not chosen a Democrat for president since Bill Clinton in 1992.

Pennsylvania - 20 Electoral College votes

Pennsylvania is the biggest prize remaining, with 20 electoral votes.

As in Georgia, Mr Trump was leading on election night, but Mr Biden has been eating into the lead ever since as mail-in votes are counted. 

On Friday afternoon, Mr Biden is lading by over 5,000 votes, with the remaining votes expected to favour the former Vice President.

Arizona - 11 Electoral College votes

One wild card that could upset these calculations: Arizona.

Fox News and The Associated Press have already called the state's race in Mr Biden's favour, but other networks including CNN and NBC have said it is still too close to call.

Arizona's Secretary of State Katie Hobbs told ABC News that she did not expect a final count yesterday, but also that she does not expect a recount.

"It's not looking like today, probably closer to tomorrow that we'll be closer to getting through all those ballots," Ms Hobbs said.

Yesterday evening, Mr Biden had a lead of about 46,000 votes with about 90% of the ballots counted.

Paths to victory

Much of the delay has resulted from a flood of mail-in ballots due to the coronavirus pandemic and those votes have tended to favour Democrats.

If Mr Biden's lead in Arizona holds, and he wins Nevada or Georgia, he would pass the threshold of 270 electoral votes.

Should Mr Trump hold North Carolina and Georgia but lose Arizona, he must take Nevada, as well as Pennsylvania, to win.

Simply winning Pennsylvania, where Mr Trump leads but faces a possible onslaught of pro-Biden mailed ballots, will not be enough for the president, even if he takes Alaska's three electoral votes as expected.

Much to Mr Trump's chagrin, Pennsylvania has decided to allow mailed ballots sent by election day but received up to three days afterwards to be counted. Authorities expect to complete the count by today.

Another factor that could keep the battle alive: the Trump campaign has unleashed a legal blitz in key states vital to the incumbent's re-election.

It has sued to disqualify late-arriving ballots in Pennsylvania, sued in Nevada and Georgia over alleged irregularities, and has demanded a recount in Wisconsin.