70 ILCS 705/14.07
Upon the organization of the consolidated district, the duties of trustees and other officers of each district consolidated therein shall cease. If a consolidated district is wholly contained within a single county, the trustees for the consolidated district shall be appointed by the presiding officer of the county board with the advice and consent of the county board. If the consolidated district lies in more than one county, the number of trustees who are residents of a county shall be in proportion, as nearly as practicable, to the number of residents of the district who reside in that county in relation to the total population of the district.
Upon the expiration of the term of a trustee who is in office on the effective date of this amendatory Act of 1975, the successor shall be a resident of whichever county is entitled to such representation in order to bring about the proportional representation required herein, and he shall be appointed by the county board of that county, or in the case of a home rule county as defined by Article VII, Section 6 of the Constitution of 1970, the chief executive officer of that county, with the advice and consent of the county board.
Thereafter, each trustee shall be succeeded by a resident of the same county who shall be appointed by the same appointing authority; however, the provisions of the preceding paragraph shall apply to the appointment of the successor to each trustee who is in office at the time of the publication of each decennial Federal census of population.
The appropriate appointing authority shall appoint 3 trustees of the consolidated district within 60 days after the entry of the order consolidating the districts. The trustees shall be electors in the consolidated district, provided not more than one of them shall be from any city or village or incorporated town in the district unless such city or village or incorporated town shall have more than 50% of the population in the district according to last preceding Federal Census in which are included two or more cities or villages or incorporated towns. The trustees shall hold such terms of offices and shall have such powers and qualifications as is provided for trustees under Section 4 of "An Act in relation to fire protection districts".
70 ILCS 705/14.07