The ZIP code is less like a cold, clinical, ordered list of numbers, and more like a weird overgrown number garden. It started as a way to organize mail after WWII, but now it pops up all over our daily lives. You type it into the machine at the gas station to verify your credit card. You might type it into a rental search website if you're looking for a new apartment. Back in 2013, the ZIP Code contributed about 10 billion dollars a year to the US economy.

On today's show, we turn our attention towards the humble ZIP code. Why was it born? How has it changed the mail? How has it changed the broader world? And... has it gone too far?

This episode was hosted by Sally Helm. It was produced by Sam Yellowhorse Kesler with help from Willa Rubin. It was edited by Meg Cramer, and fact-checked by Sierra Juarez. It was engineered by Valentina Rodríguez Sánchez. Alex Goldmark is Planet Money's executive producer.

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