Miss. Code § 23-15-11
Every inhabitant of this state, except persons adjudicated to be non compos mentis, who is a citizen of the United States of America, eighteen (18) years old and upwards, who has resided in this state for thirty (30) days and for thirty (30) days in the county in which he or she seeks to vote, and for thirty (30) days in the incorporated municipality in which he or she seeks to vote, and who has been duly registered as an elector under Section 23-15-33, and who has never been convicted of vote fraud or of any crime listed in Section 241, Mississippi Constitution of 1890, shall be a qualified elector in and for the county, municipality and voting precinct of his or her residence, and shall be entitled to vote at any election upon compliance with Section 23-15-563. If the thirtieth day to register before an election falls on a Sunday or legal holiday, the registration applications submitted on the business day immediately following the Sunday or legal holiday shall be accepted and entered in the Statewide Elections Management System for the purpose of enabling voters to vote in the next election. Any person who will be eighteen (18) years of age or older on or before the date of the general election and who is duly registered to vote not less than thirty (30) days before the primary election associated with the general election, may vote in the primary election even though the person has not reached his or her eighteenth birthday at the time that the person seeks to vote at the primary election. No others than those specified in this section shall be entitled, or shall be allowed, to vote at any election.
Miss. Code § 23-15-11