735 ILCS 5/18-104: Limitation.

No action shall be brought by quo warranto, or otherwise, questioning the legality of the organization of any county, city, village, incorporated town, township, school district, park district, road district, drainage district, sanitary district, authority or any other municipal corporation or political subdivision in the State of Illinois after such municipal corporation or political subdivision has been in de facto existence for a period of 3 years.