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Include floor, suite, and apartment numbers whenever possible. These should be placed on the same line as the street address. Place the city, state, and ZIP Code in that order on the last line. This must be the last line.

Canadian Postal Codes: A Canadian postal code is a six-character string that forms part of a postal address in Canada. Canada's postal codes are alphanumeric. They are in the format A9A 9A9, where A is a letter and 9 is a digit, with a space separating the third and fourth characters.

The Nigerian Postal Code is a numeric code consisting of a six-digit number. The Nigerian Postal Service (NIPOST), divides the country into 9 regions, which are the first digits of the code. The 2nd and 3rd digits, combined with the first, are the shipping districts for outbound sorting.

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.

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.

The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

It is preferred that all City, State, and ZIP Code information be on a single line.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.