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Zip codes help tell postal workers where a letter or package is going.By looking at the numbers in these codes, a mail sorter can determine where the parcel should go. Each digit in a ZIP code stands for specific areas or regions of the United States (US).

The first is that humans don't behave based on administrative units such as zip codes, or even census units. Their behavior is influenced much more by their neighbors, or areas such as neighborhoods or high activity areas (such as central business districts).

ZIP+4 Codes (or ZIP Plus 4 Codes) are the final 4 digits of a full nine-digit ZIP Code.The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas. ZIP plus 4 codes assist the USPS in effectively sorting and distributing mail.

Zip codes help tell postal workers where a letter or package is going. In the United States, ZIP codes are a type of postal code. Individuals who mail letters or packages via the United States Postal Services (USPS) are required to write the code as part of the address.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west.

ZIP codes are five digits long. The first digit is assigned to a broad geographical area of the United States, ranging from zero in the Northeast to nine in the West. The next two digits pinpoint population concentrations and sectional centers accessible to common transportation networks.

Despite the geographic derivation of most ZIP Codes, the codes themselves do not represent geographic regions; in general, they correspond to address groups or delivery routes.The USPS ZIP Codes identify the individual post office or metropolitan area delivery station associated with mailing addresses.