Miss. Code § 21-1-59
Provided further, that any future changes in the boundaries of a presently existing municipality which extends into or further extends into a county other than the county in which the municipality's principal office is located shall not affect the public school district located in the annexed area, unless and until consent thereto shall have first been obtained in writing from the board of trustees of the school district proposed to be partially or wholly included in the change of municipal boundaries.
Provided further, that any change in the boundaries of a presently existing municipality of any Class 1 county having two (2) judicial districts, being traversed by U.S. Highway 11 which intersects U.S. Highway 84, shall not affect the public school district located in the annexed area and shall not change the governmental unit to which the school taxes are paid, unless approved by referendum as hereinafter provided.
In the event that twenty percent (20%) of the registered voters residing within the area to be annexed by a municipality petition the governing body of such municipality for a referendum on the question of inclusion in the municipal school district within sixty (60) days of public notice of the adoption of such ordinance, such notice given in the same manner and for the same length of time as is provided in Section 21-1-15 with regard to the creation of municipal corporations, the governing body of the county in which the area to be annexed is located shall hold a referendum of all registered voters residing within the area to be annexed on the question of inclusion in the municipal school district. Approval of the ordinance shall be made by a majority vote of the qualified electors voting in said referendum to be held within ninety (90) days from the date of filing and certification of the petition provided for herein on the question of such extension or contraction. The referendum shall be held in the same manner as are other county elections.
The inclusion of buildings or grounds of any state institution within the area of a municipal incorporation or expansion in any proceedings creating a municipality or enlarging the boundaries of a municipality prior to the effective date of Senate Bill 2307, 1987 Regular Session (Chapter 359, eff March 18, 1987), is hereby ratified, confirmed and validated, regardless of whether such inclusion was in conformity with the requirements of this section at the time of such proceedings, and such inclusion shall not be void or voidable by any affected state institution on or after the effective date of Senate Bill 2307, 1987 Regular Session (Chapter 359, eff March 18, 1987). This paragraph shall not be applicable to and shall not be construed to validate the inclusion of buildings or grounds of any state institution within the area of a municipal incorporation or expansion where such inclusion or the proceedings involving such inclusion were declared invalid or void in a final adjudication of a court of competent jurisdiction prior to the effective date of Senate Bill 2307, 1987 Regular Session (Chapter 359, eff March 18, 1987), and the decision of such court was not appealed within the applicable time period for appeals from such court or was not overturned by any court to which an appeal may have been made.
Miss. Code § 21-1-59