Some of those changes are more substantial than others.
California, Nevada, New Jersey and Vermont, along with Washington, D.C., are sending mail-in ballots to all voters, joining the handful of states that conduct all-mail elections. In Montana, individual counties are now authorized to send voters ballots. And many more states are mailing voters absentee ballot applications.
There's also been a big expansion in who can vote absentee. Many states, including New Hampshire and New York, have suspended the need for an excuse to obtain an absentee ballot, or said fear of contracting COVID-19 while voting is a valid excuse.
Other states have altered deadlines and/or loosened rules for submitting an absentee ballot. Some states — often as the result of litigation — have said mail-in ballots only need to be postmarked by Election Day, rather than received by then. And in Virginia, for instance, an absentee ballot won't need a witness signature.
The graphic above gives a broad overview of mail-in voting procedures for each state and some basic deadlines voters should know.
Here are a few caveats as you look up your state's information:
In short, the voting rules and procedures vary widely, so be sure to check with your state for the most detailed and up-to-date information.
With (lots of) research help by Washington Desk editorial assistant Elena Moore. This map was originally published on Sept. 14.