“The Shortest Possible Path Through Every Zip Code in the U.S.”

Zip codes are funny things. There are close to 42,000 of them, and when you start plotting them on a map, you realize there’s a certain method to how the numbers are set up, such that you can slice the country into ever-smaller chunks depending on how you group Zip codes together.

Read more at: www.washingtonpost.com

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