Former vice president Joe Biden had won the primary by a landslide, taking around 60% of the vote, winning every county in the state and gaining 44 delegates, while senator Bernie Sanders received almost 35% of the vote and 24 delegates.

[1] Missouri was one of six states (along with Democrats Abroad) which held primaries on March 10, 2020, one week after Super Tuesday.

In the open primary, candidates had to meet a threshold of 15 percent at the congressional district or statewide level in order to be considered viable.

The 68 pledged delegates to the 2020 Democratic National Convention were allocated proportionally on the basis of the results of the primary.

At the meeting of the Democratic state committee in Jefferson City on May 9, 2020, the 9 pledged PLEO delegates were voted on, while the 15 pledged at-large delegates should have been selected at the subsequent state convention in Columbia on June 20, 2020.