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It can also do a reverse lookup and tell you all the cities covered by a particular ZIP code. ... The first number in a ZIP code corresponds to the state an address is located in, acting as the ...
If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.
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In a database, storing the ZIP+4 code in a 10 character field (with the hyphen) allows easy output in the address block, and storing the check digit in a 3-digit field (instead of calculating it) allows automatic checking of the validity of the ZIP+4 and delivery point fields in case one had been changed independently.
A barcode can be printed by the sender (some word-processing programs such as WordPerfect [20] include the feature), but this is not recommended, as the address-to-ZIP lookup tables can be significantly out of date. Customers who send bulk mail can get a discount on postage if they have printed the barcode themselves and have presorted the mail.
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