Zip codes California Sierra

In 1967 the system of ZIP codes became obligatory in all territory of the USA.For calculation and check of the complete postal address and ZIP code, or a delivery point, there is a special technique and the software (Coding Accuracy Support System).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.