Create Zip Code Contract For Free

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

Many cities will have multiple towns or suburbs with the same name like in the example above. If the US Postal service has more than one zip code for a city, we will list the city with each of the zip codes.

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.

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.

As regular postal deliverers went off to war, their replacements were given a series of codes to identity addresses, as they were unlikely to have the institutional memory for locations that regular mail deliverers had learned. By 1967, 65 percent of all mail delivered had zip codes.

[2] The first three digits of the ZIP code were invented by Robert A. Moon, who came up with a system for dividing the country into approximately 900 geographical areas. Eventually, H. Bentley Hahn contributed the fourth and fifth digits, which added further precision to geographic locales.

It is preferred that all City, State, and ZIP Code information be on a single line.