Around 67% of Americans from voting-population voted in the 2020 Presidential election, which is recorded to be the highest in the century.
More than 160 million people may have voted in the presidential election, according to a preliminary estimate by the University of Florida professor Michael McDonald, who runs the nonpartisan election data in the U.S. Elections Project. It was predicted that around 150 million people comprising 65% would vote, but almost 66.9% of the voting-eligible population turned out for the election.
This high turnout has especially happened during a pandemic, which left many wary of going to the polls. States had expanded voting options, and many Americans used early and mail-in ballots to cast their vote. Mail-in ballots might be one of the reasons for such high rates.
Hence, by looking into all the election data, less than 33% did not vote from the eligible population. So, the people who voted for Trump and Biden altogether are higher than those who did not vote.