Miss. Code Ann. § 59-1-1

Any city in the State of Mississippi having a seaport or harbor therein designated as a port of entry by the United States government shall have a harbor commission, to be known as a port commission, and same shall be composed of five resident citizens of such city, who shall be qualified electors therein, three of whom shall be skilled and experienced in maritime affairs. Said commission shall have jurisdiction over the port and terminals and harbor and passes leading thereto, and all vessels, boats and wharves, common carriers and public utilities therein, using the same, within their respective cities. In the cities of Natchez, Vicksburg and Greenville, the mayor and board of commissioners, or mayor and board of aldermen of such cities shall be the port commissioners of their respective harbors.