75 ILCS 5/4-2
In villages under the commission form of government, the village council at its first regular meeting following the election establishing a public library, shall appoint a board of library trustees of 6 members who are village residents, 2 to hold until the first regular meeting of the next succeeding fiscal year, 2 to hold for one year thereafter and 2 to hold for 2 years thereafter. The respective successors of the initial appointees shall be appointed for 6 year terms and shall serve until their successors are appointed and qualified.
Any board may provide by resolution that the term of its trustees shall be 4 years. If the board adopts such a resolution, then at the time the next appointments are made, one trustee shall be appointed for a 2 year term.
75 ILCS 5/4-2