Ala. Const. art. IX, § 198

The house of representatives shall consist of not more than one hundred and five members, unless new counties shall be created, in which event each new county shall be entitled to one representative. The members of the house of representatives shall be apportioned by the legislature among the several counties of the state, according to the number of inhabitants in them, respectively, as ascertained by the decennial census of the United States, which apportionment, when made, shall not be subject to alteration until the next session of the legislature after the next decennial census of the United States shall have been taken.