The Interactive ZipScribble Map connects all the Zip or postal codes in a country in ascending order. The resulting map provides a visual representation of how countries around the world arrange or order their post code systems.
If you view the ZipScribble map of the USA, you can immediately see that zipcode density appears to closely follow population density (the more people that there are in an area then the more zipcodes there are).
As I understand it the first digit of a U.S. zipcode represents the state. If you turn on the colors on the map you can see that zipcodes do indeed seem to remain within state lines.
Use the drop-down menu beneath the map to view the postal code maps for other countries. There are maps for 38 different countries in all.
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