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Understanding Indian PIN Codes

The PIN (Postal Index Number) code system is the foundation of India's postal network. Every address in India is assigned a 6-digit PIN code that helps India Post sort and deliver over 6 billion mail pieces annually across 1.5 lakh+ post offices.

PIN Code Structure

Every PIN code follows a fixed 6-digit format:

[REGION] [SUB-REGION] [DISTRICT] [OFFICE]
1 1 0 001
─ ─ ─ ───
1 digit 1 digit 1 digit 3 digits
  • 1st digit: Postal region (1–8 for geographic zones, 9 for Army/Field Post)
  • 2nd digit: Sub-region or postal circle within the region
  • 3rd digit: Sorting district used for mail routing
  • Last 3 digits: Specific post office within the sorting district

Region-wise First Digit

DigitStates / Region
1Delhi, Haryana, Himachal Pradesh, J&K, Ladakh, Punjab, Chandigarh
2Uttar Pradesh, Uttarakhand
3Gujarat, Rajasthan, Daman & Diu, Dadra & Nagar Haveli
4Maharashtra, Goa, Chhattisgarh, Madhya Pradesh
5Andhra Pradesh, Telangana, Karnataka
6Kerala, Tamil Nadu, Puducherry, Lakshadweep
7West Bengal, Odisha, NE States, Andaman & Nicobar, Sikkim
8Bihar, Jharkhand
9Army Post Office (APO) / Field Post Office (FPO)

Why Correct PIN Code Matters

  • An incorrect PIN code can delay your mail or parcel delivery by days or even weeks
  • E-commerce platforms use PIN codes to determine serviceability and estimated delivery times
  • Correct PIN codes are essential for GST invoicing — the supply type (intra/inter-state) depends on state codes derived from PIN codes

Frequently Asked Questions

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