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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.
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There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
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.
Street Addressing will have the same street address of the post office, plus a "unit number" that matches the P.O. Box number. As an example, in El Centro, California, the post office is located at 1598 Main Street. Therefore, for P.O. Box 9975 (fictitious), the Street Addressing would be: 1598 Main Street Unit 9975, El Centro, CA.
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