[1] Senator Bernie Sanders, who had suspended his campaign two months earlier, earned the remaining 22.5% and 3 delegates.

South Dakota was one of seven states and the District of Columbia voting on June 2, 2020 in the Democratic primaries, along with Indiana, Maryland, Montana, New Mexico, Pennsylvania and Rhode Island.

In the semi-closed primary, candidates had to meet a threshold of 15% statewide (coterminous with the state's sole congressional district) to be considered viable.

On March 21, the congressional district caucus convened in Pierre to designate national convention district-level delegates.

[3] The only two candidates on the ballot in South Dakota were:[6] Michael Bloomberg, Pete Buttigieg and Elizabeth Warren had also qualified for the primary but officially withdrew their candidacies at the Secretary of State.