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In general, the first three digits designate a sectional center facility, the mail sorting and distribution center for an area. A sectional center facility may have more than one three-digit code assigned to it.

Also called ?plus-four codes?, ?add-on codes?, or ?add-ons?, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

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.

3 digit ZIP codes represent larger areas around the nation. A 3-digit ZIP code is simply the first three digits of a 5-digit ZIP code. So for Massachusetts, the 3-digit ZIP code numbers would include 021 and 019. The 5-digit ZIP code where I grew up was 01966.

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.

India does not have zip code, in India we have Postal Index Code i.e. PIN code. And they are 6 digits and not 5 digits. The 5 digit zip code for India is 12345.

PIN code stands for Postal Index Number code. Also known as Zip code or area postal code, Pin code is the post office numbering code system used by the postal service of India, India Post. The PIN was first introduced in India on August 15, 1972.