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In order to deliver mail, carriers needed a way to identify houses from the outside. A simple number system was developed using even numbers on the left side of the street/road and odd numbers on the right side of the street/road. Numbers had to be posted prominently, near the front door (most doors had mail slots back then).

Later, fire and police services required large reflective numbers on all houses.

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Q: Why do houses have numbers on the outside of the house?
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