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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.