75 ILCS 5/4-3.2

The election of the 7 trustees for the first board of library trustees shall be held at the time of the library establishment election. The 7 persons who receive, for their respective terms designated on the ballot, the highest number of votes for library trustees cast at such election shall constitute the board of library trustees. Of the 7 trustees elected, 4 shall serve terms of 4 years, and 3 shall serve terms of 2 years. As the terms of the library trustees elected in any township expire, their successors shall be elected for terms of 4 years. Trustees shall serve for 4 years and until their successors are elected and have qualified.