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bobbyn362 · 10-09-2009, 07:12 AM

sparked my interest so i googled it and here is what i found

Extension of the five-digit ZIP code providing the U.S. Postal Service with even more precise destination information to facilitate mail handling. The nine-digit ZIP is based on a system of blockface grids. The first two digits of the added four digits are a sector; the last two digits are a segment within a sector.

The USPS intends the nine-digit ZIP to be used by business mailers, not by individuals, and offers a small discount for its use. Another benefit provided by the nine-digit ZIP is that it can serve as a basis for demographic and psychographic selections from mailing lists.

http://www.answers.com/topic/zip-4

10-09-2009, 07:12 AM	#18
bobbyn362 Join Date: Sep 2009 Location: eastampton Posts: 103 iTrader: (1)	sparked my interest so i googled it and here is what i found Extension of the five-digit ZIP code providing the U.S. Postal Service with even more precise destination information to facilitate mail handling. The nine-digit ZIP is based on a system of blockface grids. The first two digits of the added four digits are a sector; the last two digits are a segment within a sector. The USPS intends the nine-digit ZIP to be used by business mailers, not by individuals, and offers a small discount for its use. Another benefit provided by the nine-digit ZIP is that it can serve as a basis for demographic and psychographic selections from mailing lists. http://www.answers.com/topic/zip-4 __________________ bbk intake,heads,cam,injectors,throttlebody,longtubes, highflowcats,