Having the correct ZIP 4 Code is essential to accurate mail delivery. The United States Postal Service uses ZIP codes to sort and deliver mailed items. In 2013, USPS tracked 158 billion mailed items. The system reduces the number of undeliverables. It also increases the speed of mail delivery, ensuring that packages arrive on time..
The United States Postal Service assigns ZIP+4 codes to addresses that have been validated. The codes help USPS to sort mail, improve delivery routes and reduce processing time at mail centres. They also allow for better matching.
In general, ZIP codes are assigned from east to west, increasing in numbers southward along the East Coast. The smallest geographic unit is a census block, which is bounded by city streets on all four sides. In most cases, the census block is divided down the middle.
The first three digits are used to find a central mail sorting facility and the last two digits are used to determine a delivery point. The ZIP Code is used by shipping companies to calculate shipping rates.
The ZIP+4 system is an addition to the five-digit ZIP Code. The additional four digits are based on delivery routes and ensure the accuracy of addresses. These codes are also used in address data management. Marketers can use them to target specific customers or segments. They can also be used for bulk mailing discounts.
ZIP+4s are often used by very large organizations. For example, the California Polytechnic State University has multiple ZIP Plus 4 codes assigned to one address.
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