Map: Detroit Postal Area Codes 1946


Thanks to the DetroitYES forum post by MikeM:

This map from 1946 shows the postal zones (forerunners of the ZIP code system) for Detroit. I think these were introduced around the time of WWII. Each zone had its own office and a lot of the zone numbers eventually became the last two digits of the ZIP code. As the city grew some of the zones were further divided.



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