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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 most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

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.

Place the recipient's name on the first line. On the second line, write the building number and street name. Include the city, state and ZIP code on the final line.

Debit and credit cards have a five-digit number called a zip code associated with them as a security feature. This is also known as a postcode, postal code, billing postcode, or billing zip code.

A valid postal code depends on where you live. The specific order of the numbers of a ZIP code are important and can be used to help identify what state an individual lives in and where their mail is sorted. The first three digits of a ZIP code correspond to the central mail processing facility used to sort the mail.

The ZIP code for a Visa credit card is usually just the ZIP code from the cardholder's current mailing address. These codes are not printed on Visa credit cards, but you can double-check a Visa card's ZIP code by looking at digital and mailed billing statements from the credit card company.

Structure of Pin Code/Postal Code The first digit represents the region in India. The second digit is the sub-region, while the third digit is the sorting district. The last three digits represent the particular post office within the district.