65 ILCS 5/11-13-19
Except as otherwise provided in this section, the corporate authorities shall cause to be published no later than March 31 of each year a map clearly showing the existing zoning uses, divisions, restrictions, regulations and classifications of such municipality for the preceding calendar year. The first map published in 1960 shall reflect all zoning uses, divisions, restrictions, regulations and classifications in effect on and prior to December 31, 1959. If in any calendar year after the first map is published there are no changes in zoning uses, divisions, restrictions, regulations and classifications in such municipality, no map shall be published for such calendar year.
The map published by the corporate authorities shall be the official zoning map. The corporate authorities may establish a fee to be charged any person desiring a copy of such map. Such fee shall be paid to the appropriate zoning officer and shall be applied to defray the cost of publication of the official map.
65 ILCS 5/11-13-19