Illinois ZIP Code List
Illinois has a total number of 2,511,541 ZIP Codes, and the first two digits range from 60-62.
This page provides a complete list of 5-digit ZIP Codes in the Illinois, along with their corresponding states, counties, and cities. A ZIP Code, short for Zone Improvement Plan, is the postal code system used by the USPS to improve mail delivery efficiency. ZIP Codes come in two formats: the standard 5-digit ZIP Code and the extended 9-digit ZIP+4 Code, which allows for more precise delivery locations such as specific buildings, apartment groups, or PO boxes.
