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Austin, Texas Zip Codes 73301 73344 78701 78702 78703 78704 78705 78708 78709 78710 78711 78712 78713 78714 78715 78717 78718 78719 78720 78721 78722 78723 78724 78725 78726 78727 78728 78729 78730 78731 78733 78734 78735 78736 78737 78738 78739 78741 78742 78744 78745 78746 78747 78748 78749 78751 78752 78753 78754 78755 78756 78757 78758 78759 78760 78761 78762 78763 78764 78765 78767 78768 78769 78772 78773 78774 78778 78779 78780 78781 78783 78785 78786 78788 78789 78799 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Austin 10, Texas, 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 Austin's zip code is 7 it is located in the "7" zone that includes the following areas: Arkansas, Louisiana, Oklahoma, and Texas.