Participation in Missouri's delegate selection process is open to all voters who wish to participate as Democrats. Missouri has open primaries, voters may select the Party of their choice at their polling location.

Tuesday 10 March 2020: Missouri Primary. Hours 6:00a-7:00p CDT (1100-0000 UTC). Delegate Pledging: Proportional Primary. Voter Eligibility: Open Primary.

Primary
Source: Missouri Secretary of State.
Status: Official. Retrieved: Thursday 23 April 2020.
Included in Nationwide vote.

68 of 79 delegates to the Democratic National Convention are pledged to presidential contenders based on the results of the voting in today's Missouri Presidential Primary. A mandatory 15 percent threshold is required in order for a presidential contender to be allocated National Convention delegates at either the congressional district or statewide level. How the Democratic Proportional Delegate Allocation Math works.

• 44 district delegates are to be allocated proportionally to presidential contenders based on the primary results in each of the State's 8 congressional districts.
• In addition, 24 delegates are to be allocated to presidential contenders based on the primary vote statewide.
  • 15 at-large National Convention delegates
  • 9 Pledged PLEOs

Primary
100% Reporting. Estimate as of 11 March 2020 21:03 EDT.

Thursday 9 April 2020: Ward, Township, Legislative District, and County Mass Meetings. Hours begin at 7:30p CDT (0030 UTC). These meetings elect delegates to the Congressional District and State Conventions.

Thursday 30 April 2020: Congressional District Conventions. Hours begin at 7:30p CDT (0030 UTC).

National Convention District Delegates are elected according to the results of the Primary.

Saturday 9 May 2020: The Democratic State Committee meets in Jefferson City.

National Convention Pledged PLEO Delegates are elected according to the results of the Primary.

Due to COVID-19, the Saturday 20 June 2020 State Convention in Columbia will be replaced with a virtual Convention from 13-19 June. "This is an unprecedented time in our state’s history and as such, we’re taking unprecedented measures to ensure the health and safety of Missourians. Leadership requires innovative and proactive planning, and our team is proving that despite COVID-19, Democrats are ready to organize however we can. While some restrictions on large events may have been lifted, we believe holding an in-person event that would see thousands of Democrats from across Missouri would be reckless and irresponsible. Missourians have lost much already, and we’re doing what we can to ensure that nobody has to choose between their health and participating in our democratic systems."

Saturday 20 June 2020 (presumably): State Convention in Columbia.

National Convention At-Large Delegates are elected according to the results of the Primary.

The remaining 11 National Convention delegates consist of

• 11 Unpledged PLEO delegates:
• 8 Democratic National Committee members.
• 2 Members of Congress (0 Senators and 2 Representatives).
• 0 Governors.
• 1 Distinguished Party Leader (former U.S. House Majority Leader Richard Andrew "Dick" Gephardt).

These 11 delegates and will go to the Democratic National Convention officially "Unpledged".