This Presidential Primary coincides with a state/local primary. These coinciding primaries tend to have an impact upon voter turnout.

Participation in Mississippi's delegate selection process is open to all voters who wish to participate as Republicans. There is no partisan voter registration in Mississippi.

Tuesday 10 March 2020 (presumably): Mississippi Primary. Hours 7:00a-7:00p CDT (1200-0000 UTC). Delegate Selection: Combined Selection Statewide: Proportional, District: Winner-Take-Most Primary. Voter Eligibility: Open Primary.

Primary
Source: Mississippi Secretary of State.
Status: Official. Retrieved: Saturday 25 April 2020.
Included in Nationwide vote.

Tuesday 10 March 2020 (presumably): All 40 of Mississippi's delegates to the Republican National Convention are allocated to presidential contenders in today's Mississippi Presidential Primary.

• 12 district delegates are bound to presidential contenders based on the primary results in each of the 4 congressional districts: each congressional district is assigned 3 National Convention delegates. [Rule 3]
• If one candidate receives a majority (more than 50%) of the vote in a Congressional District, that candidate is allocated all 3 delegates.
• Otherwise, the candidate receiving the most votes receives 2 delegates and the candidate receiving the second most votes receives 1 delegate.
• 28 at-large delegates (10 base at-large delegates plus 15 bonus delegates plus 3 RNC delegates) are bound to presidential contenders based on the statewide primary vote. [Rule 4]
• Each presidential candidate receiving 15% or more of the statewide vote is proportionally allocated delegates based on their percentage of the vote total of all candidates who met the 15% threshold. Round to the nearest whole number. If no candidate receives 15% of the vote, the threshold is 10%. The process does not describe what to do if too many or too few delegates are allocated due to rounding.

Primary (preliminary)
98% Reporting. Estimate as of 11 March 2020 08:52 EST.

CD1: winner-take-all (3 delegates) for Trump.
CD2: winner-take-all (3 delegates) for Trump.
CD3: winner-take-all (3 delegates) for Trump.
CD4: winner-take-all (3 delegates) for Trump.
Statewide:
Trump: 27 delegates × 234,278 ÷ 234,278 = 27.000 delegates. Round to 27.

National Convention delegates are bound for the until released by their candidate. [Rules 8 and 9]

In addition, 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the Mississippi's Republican Party, will attend the convention as pledged delegates by virtue of their position. [Rule 5]

Saturday 25 April 2020: Precinct Caucuses / County Presidential Conventions.

Saturday 16 May 2020: State Convention. The District and At-Large delegates are elected according to the results of the primary.