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2024 Presidential Primary 

Fort Zumwalt South High School
8050 Mexico Road
St. Peters, MO 63376

Time: 8 a.m.-12 p.m.

Missouri Democratic Party Announces Opening of Mail-Ballot Request Period for 2024 Democratic Party-Run Presidential Primary  

February 1, 2024

The Missouri Democratic Party is announcing the opening of the mail-ballot request period to vote in the presidential primary election scheduled on Saturday, March 23, 2024. Registered Missouri voters can request a ballot online here at or call 855-433-8683 to request their mail ballot.

Additionally, the Missouri Democratic Party announced the Democratic National Committee has fully approved MDP’s plan for Missouri’s 2024 Democratic Presidential Primary. The following details are confirmed with more information available soon:

  • Missouri’s Democratic presidential primary is scheduled for Saturday, March 23, 2024. 

  • The Democratic presidential primary will be a hybrid election, offering Missouri Democrats an opportunity to cast their vote by mail or at an in-person voting site from 8 AM until noon on the day of the primary. 

  • Pending final availability, at least one in-person voting site will be held in each county, with additional sites in larger counties. 

  • Missourians registered to vote by February 21, 2024, with the Missouri Secretary of State’s Office will be eligible to vote in the Missouri Democratic presidential preference primary election, so long as the voter is not registered as a Republican. 

  • The mail ballot request period will close on March 12. 

  • Ballots must be returned to the MDP by 10 AM on March 23, 2024. 

  • Votes will be counted by March 25, with the announcement to be made by March 28, 2024


In 2022, the Republican-controlled legislature passed HB 1878, which eliminated Missouri’s state-run presidential preference primary election and designated a party-run system for choosing presidential nominees. This is another attack on free and fair Democratic elections that makes it harder for people to exercise their voting rights. The Missouri Democratic Party adamantly opposed this change, and none of the Democrats serving in the Missouri State House or Senate at the time voted for this bill. Nearly every Republican member supported the measure. 

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