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The basic ZIP code is made up of five numbers. An extended ZIP + 4 code includes the five digits of the ZIP code, a hyphen and then four more digits. This lets a piece of mail to be sent to a more exact location than by the ZIP code alone.

ZIP Codes? are an integral part of making sure your mailpiece is processed quickly and efficiently. Not having a ZIP Code? on your mail causes unnecessary delay because it will require manual look-up.

The return address is not required on postal mail. However, lack of a return address prevents the postal service from being able to return the item if it proves undeliverable; such as from damage, postage due, or invalid destination. Such mail may otherwise become dead letter mail.

It is preferred that all City, State, and ZIP Code information be on a single line. If that is not possible, the ZIP Code, including the ZIP+4 Code, may be placed below the city/state information.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Writing the wrong ZIP Code with the right address usually causes the letter to be delivered about a day later than if the ZIPCode were correct. As long as the mailing address is correct, the letter will be delivered.

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. This five-digit code helps ensure that parcels get to their intended destination faster.

If the address is legible the OCR will read the address anp put the barcode on the envelope. If it cannot determine the address it will be sent to another operation where the address will be read by a human and the barcode applied then it will be sorted with the regular mail. It will get where it's supposed to.

ZIP codes can change at any time as needed by the US Postal Service. Each ZIP code is serviced by a specific post office, which may not even be in the same city as the ZIP code.

Canadian ZIP codes use an alphanumerical format with six characters in the format A1A 1A1 with the first character denoting the province of the address. The second character is a district within that province. The third character is a letter representing the postal zone of the province.