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To create a personal Zip, a postal customer would go to a postal web site, authenticate who they are, much as they do today to sign up for Informed Delivery, and provide their current address and, optionally, email address. The system would provide them their own 11 (or 12) digit Personal Zip Code.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone.

Look Up a ZIP Code? By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code?. Find by Address. By City and State. Enter city and state to see all the ZIP Codes? for that city. Find by City & State. Cities by ZIP Code? Enter a ZIP Code? to see the cities it covers.

Unknown, empty, or otherwise invalid integers are represented by 0. Zip codes will require leading zeros to correctly format 5-digit and zip-plus-4 codes. Zip-plus-4 notation using a plus-4 of all zeros (-0000) is not valid - use the 5-digit instead.

A 5-digit number that identifies a particular postal delivery area in the United States.

What is the four-digit extension? It represents a specific delivery route within that overall delivery area. For PO boxes, the four-digit extension usually includes the PO box number. Including the last four digits means mailings will arrive to their intended destination faster, as well as discounts on bulk mailings.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.