They are assigned in order from the north east to the west coast. The map of the first digit of zip codes above shows The first digit of a USA ZIP code generally represents a group of U.S. 22313 for the PO Boxes of Alexandria, VA) Unique/single high volume address (ex.Sorting packages and calculating the time and cost of shipping a package (the shipping rate). Though ZIP codes were originally developedįor USPS, many other shipping companies such as United Parcel Service (UPS), Federal Express (FedEx), DHL, and others make use of ZIP codes for The additional 4 digits help USPS more precisely group mail for delivery. The basic 5-digit format was first introduced in 1963 and laterĮxtended to add an additional 4 digits after a dash to form a The term ZIP stands for Zone Improvement Plan. Some still refer to ZIP codes as US postal codes. ZIP codes near me are shown on the map above. US ZIP codes are a type of postal code used within the United States to help the United States Postal Service (USPS) route mail more efficiently.
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