10 ILCS 5/2A-31

(a) In villages with a population of 50,000 or more, a president shall be elected at the consolidated election in 1979 or 1981 (in whichever of those years the term of the president expires) and every 4 years thereafter. (b) In villages with a population of 50,000 or more, 6 trustees shall be elected at the consolidated election in 1979 or 1981 (in whichever of those years the terms of the trustees expire) and every 4 years thereafter, unless the village has provided, in accordance with Section 3.1-25-15 of the Illinois Municipal Code, to elect trustees in the manner provided for villages with a population of less than 50,000, in which case trustees shall be elected at the time prescribed in Section 2A-30 of this Act. (c) In villages with a population of 50,000 or more, a clerk shall be elected at the consolidated election in every other odd-numbered year when the clerk is elected for a 4 year term, and in each odd-numbered year when the clerk is elected for a 2 year term.