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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.