Voter Turnout
by Ed Sawicki
This chart shows voter turnout as a percentage of the total population. It doesn't show the percentage compared to people of voting age or eligible voters because that data is not available for all the years shown. Aproximately 72 percent of the U.S. population are of voting age but not all of them are eligible to vote.
You can roughly approximate the percentage of people who voted compared to people of voting age by adding 28 to the percentages in the chart, but the result will not be accurate.
Nineteenth Amendment
The Nineteenth Amendment to the Constitution that gave women the right to vote was ratified by the requisite number of states in 1920. You see the percentage of people voting increase in the following years, except for the 1924 election.
The 2020 election had the highest level of voter turnout in history, at 46 percent of the population and about 74 percent of people of voting age.
Voter Disenfranchisement
Most U.S. states do not allow felons to vote and many states do not allow felons to vote after they've served their time in prison. The number of eligible voters in the country are the number of people of voting age minus those who are forbidden from voting because they are felons or former felons.