65 ILCS 5/6-3-3: Municipal officers - terms.

The municipality shall have the following elected officers: one mayor, one municipal clerk and one municipal treasurer, all of whom shall be elected at large, and alderpersons, the number of which shall be as follows: In cities not exceeding 25,000 inhabitants, 8 alderpersons; between 25,001 and 40,000, 10 alderpersons; between 40,001 and 60,000, 14 alderpersons; between 60,001 and 80,000, 16 alderpersons; and exceeding 80,000, 20 alderpersons. Two alderpersons shall be elected to represent each ward.