Illinois ZIP Codes by County

Also see: Illinois Area Codes by County

ZIP Codes for Cities & Towns - Sorted by County

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Information Updates

The Demographic Data for the 4,528 Illinois cities, towns, counties, ZIP Codes and Census Designated Places (CDPs) profiled in this gazetteer is updated annually. Last Update: July 1, 2014.

The ZIP Code maps and the data regarding the number of residential and business addresses in each ZIP Code are updated four times per year. Last Update: August 1, 2014.

The information on the 62,219 Illinois Physical, Cultural and Historic Features is updated six times per year. Last Update: August 2, 2014.

The School Attendance Zone Maps for 3,953 Illinois public schools are updated four times per year. Last Update: July 8, 2014.