55 ILCS 5/5-1108

Additional duties of recorder in counties of less than 1,000,000. In counties with a population of less than 1,000,000, the county board, by ordinance or resolution, may authorize the recorder to (a) establish a map making department with sole authority over the preparation, maintenance and designation of all maps required for use by the county, including but not limited to, those maps required for assessment purposes; (b) establish a permanent real estate index number system; or (c) prepare and maintain up-to-date lists of property owners names and addresses.