These votes represent nearly 43% of registered voters nationwide, according to a survey of electoral officials in all 50 states and Washington, DC, by CNN, Edison Research and Catalist.
Fourteen states have seen more than half of their registered voters vote by November 3.
Nationwide, more than 90 million votes were cast, representing about 66% – almost two thirds – of the more than 136.5 million votes cast in the 2016 presidential election.
About half of the votes cast in this cycle come from those 16 key states, which will play a key role in determining who will win this year’s presidential election.
Some information about voters comes from Catalist, a company that provides data, analysis and other services to Democrats, academics and nonprofit organizations and is providing information. Details on who will vote before November.
Democratic candidate Joe Biden has shown a strong preference for mail-based voting, while most of President Donald Trump’s supporters say they want to vote on Election Day.
Trump and Biden’s schedules for the final stages of this campaign have reflected the focus on those competitive states.
On the weekend before Election Day, Trump will spend Saturday in Pennsylvania, while Biden is campaigning in Michigan with former President Barack Obama. Then, Biden will arrive in Philadelphia on Sunday, as the President has planned five protests in five key states – Michigan, Iowa, North Carolina, Georgia and Florida.
CNN’s Veronica Stracqualursi contributed to this report.