Invent Zip Code Document For Free - Zip Document

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

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

The package should still get delivered to the correct address, but it will probably take more time. Someone, a clerk probably, would have to look up the address and write the correct zip code on it, then send it back out to it's intended destination.

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.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

[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.

The next was 01001, given to Agawam in Massachusetts. Due to its number, this is sometimes misattributed as the first ZIP code. However, it was simply the starting point for zone separation in the continental United States after Puerto Rico had been divided into regions.