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The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

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A ZIP code is the American equivalent of a Canadian postal code. It consists of five digits, sometimes followed by an additional four digits for more precise location identification. In Canada, the postal code format includes both letters and digits, with a space separating the third and fourth characters.

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Postal codes in Canada are a six-character string consisting of three letters and three digits. For example, the postal code for the CN Tower in Toronto is M5V 3L9. Every mailing address in Canada has a postal code, which helps mail carriers and couriers sort and deliver mail.

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.

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.