10 ILCS 5/2A-32

In each incorporated town with a population of 50,000 or more, a president, a clerk, a collector, a supervisor and an assessor, when required, shall be elected in every incorporated town at the consolidated election in 1985 and at the consolidated election every 4 years thereafter. A trustee shall be elected to succeed each trustee whose term expires in a particular year, such election to be held at the consolidated election in odd-numbered years. The term of office of a trustee which expires in 1984 is extended to 1985 and the term of office of a trustee which expires in 1986 is extended to 1987.