Mail voting is now allowed in 3 of 4 states — see its evolution

Many more states offer ways to vote before Election Day than in the past, though mail voting rules vary by state.

*Includes District of Columbia.
Note: Election voting options were temporarily expanded in 2020 because of the Covid-19 pandemic. Percentages may not total 100% because of rounding.

Source: The Center for Election Innovation & Research

Graphic: Amy O'Kruk, CNN