Miss. Code Ann. § 9-9-45

When hereafter any county of the state shall become eligible by reason of the growth in population, in assessed valuation and the existence therein of a municipality of the number of inhabitants all as specified in Section 9-9-1 of this chapter, it shall be the duty of the Governor, upon the determination by him of the facts aforesaid, to issue his public proclamation establishing a county court in the said county, and calling an election on a date to be fixed in said proclamation for the election of a county judge. The term of office of a county judge elected under this section and Section 9-9-39 shall expire thereafter at the same time at which there expires the regular terms of circuit judges and chancellors. When in the last year of any four-year judicial period any county has fallen below the requirements of eligibility as stated in Section 9-9-1 of this chapter, it shall be the duty of the Governor so to ascertain and proclaim, thereupon after the expiration of the then four-year term, the county court shall cease to exist in such county, unless by an election held under the provisions of Section 9-9-39 the said court be retained or reestablished.