Zip codes Virgin Islands Saint Croix

ZIP code data is an integral part of dealer/store locator software on many web sites, especially brick-and-click websites. This software processes a user-input ZIP code and returns a list of store or business locations, usually in order of increasing distance from the center of the input ZIP code. As the ZIP system is confined to the U.S. Postal network, websites that require ZIP codes cannot register customers outside the U.S.In 1967 the system of ZIP codes became obligatory in all territory of the USA.In modern conditions, with introduction of the highly technological equipment for mail sorting, it is enough to use a five-digit ZIP code.Many gasoline pumps that offer "pay at the pump" require credit card customers to enter the ZIP code of their billing address as a form of added security.