55 ILCS 5/5-1036
A county board may authorize the vacation of any town plat when the same is not within any incorporated town, village or city, on the petition of two-thirds of the owners thereof: Provided, that any such order of vacation shall be passed by the affirmative vote of at least two-thirds of the members of the county board, the vote to be taken by ayes and nays and entered on the records of the county board. The county board, in behalf of the county, may in such case contract for and receive from the owner or owners of property abutting upon a street or alley, or part thereof, so vacated, compensation in an amount which, in the judgment of the county board, shall be equal to the benefits which will accrue to the owner or owners of the abutting property by reason of the vacation. The validity of any vacation shall not be questioned by reason of the payment of any such compensation, nor by reason of benefits specially accruing therefrom to the owner or owners of abutting property. The determination of the county board of the nature and extent of the public use or public interest to be subserved is such as to warrant the vacation of the street or alley or part thereof, so vacated, shall be final and conclusive, and the passage of such order shall be sufficient evidence of the determination, whether so recited in the order or not. The relief to the public from further burden and responsibility of maintaining the street or alley, or part thereof, so vacated shall constitute a public use or public interest authorizing the vacation. When property is damaged by the vacation or closing of any street or alley, the same shall be ascertained and paid as provided by law.
55 ILCS 5/5-1036