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?the five-digit ZIP number is a structured code in which the first digit identifies one of ten large areas of the Nation, and the second digit indicates a State, a geographic portion of a heavily populated State, or two or more less populated States.

The current postal codes in the United States range from 00001 ? 99950. The lowest and highest of these postal codes are both specific to areas in Alaska; The 00001 code is for the N Dillingham area, and the postal code 99950 is for Ketchikan, AK.

Actually, zip code 99999 doesn't even exist. In fact, the highest real zip code is 99950, for Ketchikan, Alaska. Still, if you scour your database, there's a good chance you'll find more than a few 99999 zip codes. Most organizations find that it's been entered as a placeholder in their shipment database.

The four extra numbers are added after a hyphen to complete the ZIP+4. 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.

In 1943, a system of postal districts was formed for major cities. Each district was assigned a one- or two-digit code that senders would place in between the city name and the state name. This helped, but the increased volume of mail soon created a need for mechanization.

In 1963 the Post Office Department introduced the Zone Improvement Plan (ZIP) Code as a means to allow mail sorting methods to become faster and eventually be automated, but the innovation also created unimagined socio-economic benefits as an organizing and enabling device.

To identify delivery points individually, the USPS gives each one a unique 11-digit number. The number is composed of the delivery point's nine-digit ZIP+4 Code plus an extra two digits that narrow the designation to the delivery point itself.

Primary state prefixes. ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.