Postal codes came early in many places to allow machine sorting. Now optical ones are even better. Zip was reasonably early. Later on e with Alpha numerics wer

Postal codes came early in many places to allow machine sorting. Now optical ones are even better. Zip was reasonably early. Later on e with Alpha numerics were better. Zip added a suffix number later https://www.zip-codes.com/learn-about/what-is-a-zip-4-code.asp https://www.zip-codes.com/learn-about/what-is-a-zip-4-code.a...