105 ILCS 5/17-10
The county clerk shall furnish the school board of any school district, upon request, a certificate showing the last ascertained full, fair cash value of the taxable property of the district.
When a school district lies partly in two or more counties, the county clerk of each county in which any part of such district lies shall furnish, upon request, to the school board of the district, a certificate showing the last ascertained full, fair cash value of the taxable property in that part of the district lying in such county.
When making out the tax books for the collector, the county clerk shall compute each taxable person's tax in each school district upon the total amount of taxable property for that year, located in such district, whether belonging to residents or non-residents, upon the valuation produced by the equalization and assessment of property by the county board of review, and all property originally assessed by the Department of Revenue. Such computation shall be made so as to realize the amount of money required to be raised in such district, as shown in the certificate of tax levy, made out by the governing body of such district, and filed with the county clerk as required by this Act. The county clerk shall cause each person's tax, so computed, to be set upon the tax book to be delivered to the collector for that year, in a separate column against each taxpayer's name, or parcel of taxable property, as it appears in the collector's books, to be collected in the same manner, and at the same time, and by the same person, as State and county taxes are collected. He shall number the school districts on the maps in his office to correspond with the numbers of districts as returned to him by the county superintendent of schools, and in making up the tax books to be delivered to the collector of taxes, the county clerk shall copy therein the number of the school districts set opposite each person's assessment of personal property by the assessor making the assessment of such person, and shall extend the school tax on each person's assessment of personal property. The computation of each person's tax and the extension made by the clerk shall be final and conclusive. The rate shall be uniform, and shall not exceed that required by the amount certified by the school board. The county clerk, before delivering the tax book to the collector, shall make and send by mail to each school treasurer of the county a certificate of the amount due his district or districts from the tax so extended and placed on the tax books.
105 ILCS 5/17-10