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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.

Fortunately, there's an easy solution. When prompted for your ZIP code, enter the three digits from your postal code, followed by ?00.? For example, if your postal code is M4B 1G5, your credit card ZIP code would be 41500.

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.

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

The United States Postal Service (USPS) establishes postal ZIP codes to assist in the efficient sorting and routing of mail.

The first digit of a five-digit ZIP Code divides the United States into 10 large groups of states (or equivalent areas) numbered from 0 in the Northeast to 9 in the far West. Within these areas, each state is divided into an average of 10 smaller geographical areas, identified by the second and third digits.

What each number means. The first digit designates a broad area, which ranges from zero for the Northeast to nine for the far West. The two following digits are the code of a central post office facility in that region. The last two digits designate small post offices or postal zones.

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.

This random jump of numbers is because geography didn't determine area code designations?population density did. The Bell System, formerly a system of companies led by the Bell Telephone Company, created the first area codes back in the 1940s called the North American Numbering Plan.

There is none. Postal/zip codes around the world don't follow a common pattern. In some countries they are made up by numbers, in others they can be combinations of numbers an letters, some can contain spaces, others dots, the number of characters can vary from two to at least six...