After this number, the rest of the digits are generally assigned from east to west. When reading a ZIP code, first you have to understand that the first number represents a group of States. The final formula was a ZIP+4 code, this way they improved the precision in the group's mailing. In 1963 the USPS introduced a basic 5-digit format, after a trial period, they decided to add 4 more digits. There are different types of Zip Codes, among them, you can find the Standard, the Military, the PO Box (that is an unique number issued for a specific business or brand), and the Unique or single high volume address. At first the code was used by the USPS only, but after proving the efficiency of this method, the code was embraced by other shipping companies such as: United Parcel Service (UPS), Federal Express (FedEx), DHL, and others. A Zip Code is a numeric code that the United States Postal Service uses to maintain a more efficient rout mail.
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