65 ILCS 5/6-2-1: Adoption.

All municipalities of not less than 5,000 population and not exceeding 500,000 population which are treated as properly incorporated, or which hereafter are incorporated, under this Code, in addition to all rights, powers, and authority conferred upon them elsewhere in this Code, shall have the rights, powers, and authority conferred in this article, by proceeding as hereinafter provided.