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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.

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.

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.

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.

Why do some buildings have their own zip codes? Some buildings, as well as companies or government agencies, have a unique 5-digit ZIP Code due to the volume of mail they receive.

ZIP is an acronym for Zone Improvement Plan. However, the USPS intentionally chose the acronym to indicate that mail travels more quickly when senders mark the postal code on their packages and envelopes.

How to Create Map from Zip Codes Using Mapize Zip Code Map Maker Copy all your data from the spreadsheet, and paste it into Mapize's map-making tool in the location data box to the right. Or, save your sheet as a CSV file and upload it in the ?Drag and Drop? section on the left. ... Click ?Create Map.?

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