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Tucson, Arizona Zip Codes 85701 85702 85703 85704 85705 85706 85707 85708 85709 85710 85712 85713 85714 85715 85716 85717 85718 85719 85720 85721 85723 85724 85725 85726 85728 85730 85731 85732 85733 85734 85736 85737 85738 85739 85740 85741 85742 85743 85744 85745 85747 85748 85749 85750 85751 85752 85754 85775 85777 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Tucson 10, Arizona, 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 Tucson's zip code is 8 it is located in the "8" zone that includes the following areas: Arizona, Colorado, Idaho, New Mexico, Nevada, Utah, and Wyoming.