

The same ZIP+4 code by using the last several digits of the PO Box number. Sometimes, several PO Box numbers are grouped into It is also common for each PO Box number to correspond to a unique ZIP+4 code. A ZIP+4 code may correspond to a city block, group of apartments, orĪn individual high-volume receiver. The ZIP+4 code is not required, but it aids the post office in additional sorting of mail. It's easy to follow the gradient across each of the zonesĮven though there are a few exceptions (such as the southwest tip of Georgia which uses 39XXX like central Mississippi).

In the map, 0 is closer to white and 9 is much more vivid.
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Map of the first 3 digits of zip codes, the digits after the first are also The sec centers are not open to the public and usually do most sorting overnight. All mail with the same first 3 digits is first delivered to the same sec center where it is sorted according to the last 2 digits and distributed to The first 3 digits of a ZIP code determine the central mail processing facility, also called sectional center facility or "sec center", that is used to process and 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)

