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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 following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.

India does not use a 5-digit zip code system. Instead, India uses a 6-digit postal code system known as PIN codes (Postal Index Number). PIN codes were introduced in India in 1972 to simplify the process of sorting and delivering mail.

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.

The five-digit code which initially specified an area or a part of a town was no longer accurate or efficient enough. So, USPS created 9-digit ZIP Codes to ensure fast and accurate mailings.

HTML <form> <input id="zipcode" class="zipcode" type="text" value="" required pattern="\d{5,5}(-\d{4,4})?"> <input type="submit" text="submit"> </form>

If prompted for your ZIP code, just enter the three digits of your postal code plus two zeros. So for example, if your postal code is A2B 3C4, the 5-digit number you should enter is 23400. Contact your card issuer if you have any questions.

Primary state prefixes. ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.