Postal Codes of Cook County, Illinois, United States

Cook County, United States Postal/Zip Codes

Cook County is a locality of United States in the Americas continent from the region of Illinois. Known as the ZIP Code with five digits 99999* or the ZIP+4 Code with nine digits 99999-9999* (while the minimum requirement is the first five digits, the U.S. Postal Service encourages everyone to use all nine). Also used by the former US Pacific Territories: Federated States of Micronesia; Palau; and the Marshall Islands, as well as in current US territories American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands. An individual delivery point may be represented as an 11-digit number, but these are usually represented by Intelligent Mail barcode or formerly POSTNET bar code. Cook County has the above postal codes.

This page provides information on postal codes and Administrative divisions in subordinate areas of Cook County. We also provide a corresponding map on which you can view information about the area. Illinois has 855 cities. Currency in use in Cook County is United States Dollar (USD) and to make a call to this city you must first enter +1. Current local time in Cook County, United States.