Turnout is expected to surge as the US enters the last 48 hours of a highly consequential and polarising US election.
More than 93 million Americans have already voted, according to the US Elections Project, more than 67 per cent of the total votes cast in the 2016 presidential election.
California, Texas and Florida lead the states in early voting and Democrats lead Republicans 45.6 per cent to 30.3 per cent in turnout.
These numbers suggest there will be a record turnout in this election, surpassing the nearly 139 million votes cast in 2016.
In an effort to pull in the last voters, President Donald Trump and Joe Biden will campaign in five swing states that will probably decide the outcome.
Final polls before the vote show a competitive race between the two candidates who set out their closing messages in drastically opposing ways.
Mr Trump touted reopening the US economy and “getting back to normal” despite a second wave of Covid-19 infections and more than 230,000 dead in the country.
Mr Biden made much of his campaign about a tougher approach to handling the pandemic and reopening safely.
The latest polls show a close race in Florida, North Carolina, Georgia, Pennsylvania and Michigan.
A Washington-ABC poll released on Sunday showed Mr Trump ahead of Mr Biden by 2 per cent in Florida but trailing him by 7 per cent in Pennsylvania.
An Emerson poll showed Mr Biden leading by 7 per cent in Michigan, while Mr Trump led by 1 per cent in Iowa.
In the last hours before election day, Mr Trump was due to travel to Michigan, Florida, Georgia and Iowa, states he won in 2016 but where he is defending or trailing now.
Mr Biden will spend the last day in Pennsylvania, with four stops planned in the state that holds critical 20 electoral votes.
His nominee for vice president, Kamala Harris, will be in Georgia and North Carolina.
No Democrat has won Georgia since 1992 but polls show a lead for the Biden-Harris ticket there.
As he trails with seniors and the young, Mr Trump is trying to make inroads with black and Hispanic voters.
On Sunday, he tweeted an unsubstantiated claim that Mr Biden called black men “super predators".
But it is an uphill battle for Mr Trump to win the votes of black men.
The country’s first black president, Barack Obama, accompanied his former vice president Mr Biden in the last stretch of the campaign.
“Remember when Republicans were saying, ‘Let Detroit go bankrupt'? Now they might as well be saying, ‘Let America get Covid’," Mr Obama said in Michigan.
A video of him scoring a three-pointer on a basketball court went viral.
The surge in turnout includes younger voters.
Democratic analytics company TargetSmart says more than 6 million under the age of 30 have voted, which is three times the number of those early votes in 2016.