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WASHINGTON — Voting is underway in the presidential election between President Donald Trump and Democratic nominee Joe Biden.

Twenty-nine states begin mailing absentee ballots to voters in September and an additional nine states open up in-person voting this month. Voters in some states who requested mail ballots for the November general election have already received and returned them.

The early voting activity comes as an unprecedented number of voters are expected to vote by mail because of health concerns during the COVID-19 pandemic. In 45 states, all voters can vote by mail for the November election, and nine of those states plan to mail ballots to all registered voters.

More: Where you can vote by mail, absentee ballot in the 2020 election

By federal law, all states must send absentee ballots requested by military or overseas voters by Sept. 19.

Only six states don’t offer some form of in-person early voting – either traditional voting at polling sites or in-person absentee voting.

More: Voting starts earlier than you might realize. It has Trump battling the clock in some battleground states

By the end of the first week of October, 42 states will have started sending mail ballots to voters and 17 states will have launched in-person early voting.

Here’s a schedule of early voting and mail-voting in each state as well as the deadlines for voters to return their mail ballots.

Reach Joey Garrison on Twitter @joeygarrison.