Ala. Code § 11-43A-77

The seven council districts shall have, as nearly as is reasonable, the same population according to the last federal decennial census. The designation and boundaries of the districts shall be specifically described and set forth. With respect to municipalities already having seven council districts prior to the effective date of the council-manager form of government under this article, such municipalities shall continue after such effective date to have the same seven districts with the same boundaries, and any ordinance or ordinances creating such districts shall continue in full force and effect unless and until changed or repealed by the council.