Miss. Code § 23-15-285
The board of supervisors shall cause an entry to be made on the minutes of the board at some meeting, as early as convenient, defining the boundaries of the several supervisors districts, sub-precincts and voting precincts in the county, and designating the voting place in each voting precinct; and as soon as practicable after any change is made in any supervisors district, sub-precincts, voting precinct or any voting place, the board of supervisors shall cause the change to be entered on the minutes of the board in such manner as to be easily understood. Precinct boundaries may be changed only during the times provided in Section 23-15-283.
No voting precinct shall have more than five hundred (500) qualified electors residing in its boundaries. Subject to the provisions of this section, each board of supervisors of the various counties of this state shall as soon as practical after January 1, 1987, alter or change the boundaries of the various voting precincts to comply herewith and shall from time to time make such changes in the boundaries of voting precincts so that there shall never be more than five hundred (500) qualified electors within the boundaries of the various voting precincts of this state; provided further, this limitation shall not apply to voting precincts that are so divided, alphabetically or otherwise, so as to have less than five hundred (500) qualified electors in any one (1) box within a voting precinct. However, the limitation of five hundred (500) qualified electors to the voting precinct shall not apply to voting precincts in which voting machines are used at all elections held in that voting precinct. No change in any supervisors district, sub-precinct or voting precinct shall take effect less than thirty (30) days before the qualifying deadline for the office of county supervisor.
Miss. Code § 23-15-285