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PIN Code

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Postal Index Number (India)

India's 6-digit postal code, where the leading digit identifies one of nine geographic postal zones and the remaining digits narrow down to a delivery office.

Definition

A PIN Code (Postal Index Number) is the 6-digit code India Post uses to route mail to a specific delivery office anywhere in the country. Unlike a hyphenated format, all six digits are written together with no separator, for example 110001 for a New Delhi address.

The digits aren't arbitrary: the first digit identifies one of nine broad postal zones (eight geographic regions plus a ninth for army post offices), the second narrows that down to a sub-region, the third points to a sorting district, and the final three digits identify the specific delivery post office. Address forms and e-commerce checkouts commonly check this format with a tool like the PIN Code Validator before accepting an address.

Key Things to Know

  • Always 6 digits, no hyphen: unlike the US ZIP+4 format, an Indian PIN code is written as one unbroken 6-digit string.
  • First digit = zone: digits 1-8 cover geographic postal zones across India, while 9 is reserved for army post offices (APOs/FPOs).
  • Last three digits = delivery office: these identify the specific post office responsible for final delivery, which is the most granular level a PIN code resolves to.
  • Distinct from vehicle registration codes: a PIN code identifies a postal delivery area, not a vehicle's issuing office, that's what an RTO Code does instead.
  • Roughly 19,000 codes nationwide: India Post maintains this many active PIN codes, and getting even one digit wrong is a common cause of delivery delays.

Related Terms

RTO CodeRegional Transport Office Code (India)Bharat Series (BH)Bharat Series Vehicle Registration Mark (India)

Frequently Asked Questions

What does the first digit of an Indian PIN code tell you?
It identifies one of nine postal zones covering the country, numbered 1 through 8 for geographic regions plus 9 reserved for army post offices. Run a 6-digit code through the [PIN Code Validator](/pincode-validator/) to check it against a real zone.
What do the remaining five digits mean?
The second digit narrows the zone down to a sub-region or postal circle, the third identifies a sorting district within it, and the last three digits point to the specific delivery post office. Together all six digits pinpoint a single office responsible for final delivery.
Is a PIN code the same as a US ZIP code?
They serve the same basic purpose but aren't structured the same way, a PIN code is always exactly 6 digits with no separators, while a US ZIP code is 5 digits and can be extended to 9 with a hyphen in the [ZIP+4](/glossary/zip-plus-4/) format.
Can a PIN code cover a very large area or just one building?
It depends on population density, a PIN code in a sparsely populated rural district might cover many villages, while a single large institution or high-volume address in a city can sometimes get its own dedicated PIN code.
Do all Indian addresses need a PIN code to receive mail?
Yes, functionally every deliverable address in India falls under one of the roughly 19,000 PIN codes assigned by India Post, and omitting or mistyping it is one of the most common reasons for delayed or misrouted mail.