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Herb Klein, special assistant to President Nixon, responded by saying the next printing of envelopes would include the ZIP Code. A ZIP 4 Code uses the basic five-digit code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, a post office box, or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery.
However, initial attempts to promote universal use of the new format met with public resistance and today the plus-four code is not required.
This means that every single mailable point in the country has its own 12-digit number (in theory).
The delivery-point digits (the 10th and 11th digits) are calculated based on the primary or secondary number of the address.
The add-on code is often one of the following: the last four digits of the box number (e.g.