605 ILCS 5/6-121
In counties not under township organization the following provisions shall be applicable relating to vacancies in road district offices:
Whenever any district fails to elect the proper number of district officers to which such district may be entitled by law, or when any person elected to any district office fails to qualify, or whenever any vacancy happens in any district, from death, resignation, removal from the district or other cause, the presiding officer of the county board, with the advice and consent of the county board, shall fill such vacancy by certificate under the signature and seal of the county clerk; and the persons so appointed shall hold their respective offices until the next regular election, and until their successors are elected and qualified; and shall have the same powers and be subject to the same duties and penalties as if they had been duly elected by the electors.
When any appointment is made, as above stated, the county clerk shall cause the certificate of appointment to be forthwith filed in the office of the district clerk, who shall immediately give notice to each person appointed.
Any judicial officer of the circuit court residing in such district, or if there be no judicial officer of the circuit court residing in such district, then any judicial officer of the circuit court in the county, may, for sufficient cause shown to him, accept the resignation of any district officer of his district, and whenever he accepts any such resignation, he shall forthwith give notice thereof to the district clerk of the district, or in his absence, to the highway commissioner, who shall make a minute thereof in the district records. He shall also immediately give notice to the county clerk of any vacancy that may exist in any district office.
605 ILCS 5/6-121