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Postal voting in the United States, also referred to as mail-in voting or vote by mail, is a form of absentee ballot in the United States, in which a ballot is mailed to the home of a registered voter, who fills it out and returns it by postal mail or drops it off in-person at a secure drop box or voting center.
Postal voting reduces staff requirements at polling centers during an election.
All-mail elections can save money, while a mix of voting options can cost more.
In some states, ballots may be sent by the Postal Service without prepayment of postage.