35 ILCS 200/21-110
At any time after all taxes have become delinquent in any year, the Collector shall publish an advertisement, giving notice of the intended application for judgment and sale of the delinquent properties. The advertisement may include the street address on file with the county collector, if available, and shall include the PIN number of each delinquent property. Except as provided below, the advertisement shall be in a newspaper published in the township or road district in which the properties are located. If there is no newspaper published in the township or road district, then the notice shall be published in some newspaper in the same county as the township or road district, to be selected by the county collector. When the property is in a city with more than 1,000,000 inhabitants, the advertisement may be in any newspaper published in the same county. When the property is in an incorporated town which has superseded a civil township, the advertisement shall be in a newspaper published in the incorporated town or if there is no such newspaper, then in a newspaper published in the county.
The provisions of this Section relating to the time when the Collector shall advertise intended application for judgment for sale are subject to modification by the governing authority of a county in accordance with the provisions of subsection (c) of Section 21-40.
35 ILCS 200/21-110