Learn modern GIS with my new courses! ➡️ ⬅️ My modern GIS community Every wonder how letters and packages get to the right place? I did so I asked July 1, 1963 was a red-letter day for the U.S. Post Office, for it marked the introduction of its Zoning Improvement Plan -
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Why do we need ZIP Codes?
Zip Codes: A History
Don't say 'Post Code' \\ Say 'Zip Code'
I didn’t know how Zip Codes worked… UNTIL NOW!
Why Zip Codes are Important
Why ZIP codes have 5 numbers — and what they each mean
Understanding "Zip Code": Breaking Down Its Meaning
Almanac: The launch of Zip Codes
What Is A Zip Code: Zip Codes Explained & What Each Number Means
How much does your zip code determine where you end up in life?
A Tale of Two Zip Codes
Why do we need postal codes?
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Last Updated: May 21, 2026
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