At the general election of 1956, and every four years thereafter, there shall be elected by the qualified electors of the county a president of the board of revenue and one member for each of the four districts of the county as herein provided; and they shall hold office for the term of four years from the first Monday after the second Tuesday in January next after their election, and until their successors are elected and qualified. The four board of revenue districts shall be constituted and composed of the election precincts of this county as now constituted or as they may hereafter be changed as required by law. The four districts shall be designated as follows: The Northeastern District, the Southeastern District, the Southwestern District, and the Northwestern District. These districts shall be composed of the following election precincts as follows: Northeastern District—Faunsdale, Macon, Dayton, Thomaston, and McKinley precincts; Southeastern District—Magnolia, Pineville, Dixon’s Mills, and Shiloh precincts; Southwestern District—Myrtlewood, Hills, Nanafalia, Horse Creek, Hoboken, and Sweetwater precincts; Northwestern District—Demopolis, Jefferson, Springhill, Jackson’s Store, and Linden precincts. The members of the board of revenue shall be, at the time of their appointment or election, and during their continuance in office, qualified electors of Marengo County, and each shall have been a resident of the district for two years next preceding his or her election or appointment.