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Chicago, Illinois Zip Codes
60601
60602
60603
60604
60605
60606
60607
60608
60609
60610
60611
60612
60613
60614
60615
60616
60617
60618
60619
60621
60622
60623
60624
60625
60626
60628
60629
60630
60631
60632
60633
60634
60636
60637
60638
60639
60640
60641
60644
60645
60646
60647
60649
60651
60652
60653
60654
60655
60656
60657
60659
60660
60661
60663
60664
60665
60666
60668
60669
60670
60671
60672
60673
60674
60675
60677
60678
60679
60680
60681
60682
60683
60684
60685
60686
60687
60689
60690
60691
60693
60694
60695
60696
60697
60699
60701
60706
60707
60803
60804
60805
60827
Prior to the use of zip codes, cities were divided into regions and mail was addressed as Chicago 10, Illinois, for example, to show which region of the city the mail was intended for. As cities continued to grow this system was not sufficient and was replaced by the Zip Code. ZipCodes went into effect in 1963. The United States Postal Service (USPS) initially used a cartoon character Mr. Zip to promote the use of zip codes. In 1983 the zipcode added the last four digits in an attempt to more narrowly define an address.

The first three digits of a zip code indicate the sectional center facility which will ultimately sort and distribute that piece of mail. All mail to that 5 digit zipcode will first arrive at the sectional center facility then after sorting continue along to its exact destination.

Since the first digit of Chicago's zip code is 6 it is located in the "6" zone that includes the following areas: Illinois, Kansas, Missouri, and Nebraska.