How many mail in ballots in 2020 vs 2016

According to data from the United States Election Assistance Commission (EAC), the number of mail-in ballots cast in the 2020 presidential election was significantly higher than in the 2016 presidential election.

In the 2020 presidential election:

In the 2016 presidential election:

It's worth noting that the increase in mail-in ballots in 2020 was likely due to a combination of factors, including:

Overall, the data suggests that mail-in ballots played a significant role in the 2020 presidential election, and their use is likely to continue to grow in future elections.