65 ILCS 5/11-13-2
The corporate authorities in each municipality which desires to exercise the powers conferred by this Division 13, or who have exercised such power and desire to adopt a new ordinance, shall provide for a zoning commission with the duty to recommend the boundaries of districts and appropriate regulations to be enforced therein. The commission shall be appointed by the mayor or president, subject to confirmation by the corporate authorities. The commission shall prepare a tentative report and a proposed zoning ordinance for the entire municipality. After the preparation of such a tentative report and ordinance, the commission shall hold a hearing thereon and shall afford persons interested an opportunity to be heard. Notice of the hearing shall be published at least once, not more than 30 nor less than 15 days before the hearing, in one or more newspapers published in the municipality, or, if no newspaper is published therein, then in one or more newspapers published in the county in which the municipality is located and having a general circulation within the municipality. The notice shall state the time and place of the hearing and the place where copies of the proposed ordinance will be accessible for examination by interested persons. The hearing may be adjourned from time to time.
Within 30 days after the final adjournment of the hearing the commission shall make a final report and submit a proposed ordinance for the entire municipality to the corporate authorities. The corporate authorities may enact the ordinance with or without change, or may refer it back to the commission for further consideration. The zoning commission shall cease to exist upon the adoption of a zoning ordinance for the entire municipality.
65 ILCS 5/11-13-2