What is a PIN Code?
PIN stands for Postal Index Number. It is a 6-digit numeric code introduced by the Department of Posts, Government of India, on 15th August 1972.
The system was conceived and introduced by Shriram Bhikaji Velankar, an additional secretary in the Union Ministry of Communications. The primary objective was to eliminate confusion caused by duplicate city names, language barriers, and illegible handwritten addresses on incoming letters and parcels across India's vast geography.
The 6-Digit Hierarchy: What Each Digit Represents
Every digit in a PIN code represents a specific geographic tier, descending from a broad national zone down to an individual delivery post office:
Geographic Region
Identifies one of the 9 broad postal zones across India (Northern, Western, Southern, Eastern, or Military).
Sub-Region / State Circle
Combined with Digit 1, it narrows down the specific state, union territory, or postal circle.
Sorting District
Combined with the first 2 digits, identifies the central sorting hub or revenue district headquarters.
Delivery Post Office
The specific Head Post Office (HO) or Sub Post Office (SO) responsible for final door-to-door delivery.
- Digit 5: Southern Postal Region (covers Karnataka, Andhra Pradesh, Telangana).
- Digits 56: Karnataka Postal Circle.
- Digits 560: Bangalore Sorting District Headquarters.
- Digits 001: Bangalore General Post Office (GPO), the primary delivery office.
The 9 Postal Zones of India
India is demarcated into 9 postal zones. Zones 1 through 8 represent geographical states and union territories, while Zone 9 is exclusively reserved for the Army Postal Service (APS):
| 1st Digit | Zone Name | States & Union Territories Covered |
|---|---|---|
| 1 | Northern Zone 1 | Delhi, Haryana, Punjab, Himachal Pradesh, Jammu & Kashmir, Ladakh, Chandigarh |
| 2 | Northern Zone 2 | Uttar Pradesh, Uttarakhand |
| 3 | Western Zone 1 | Rajasthan, Gujarat, Daman & Diu, Dadra & Nagar Haveli |
| 4 | Western Zone 2 | Maharashtra, Goa, Madhya Pradesh, Chhattisgarh |
| 5 | Southern Zone 1 | Andhra Pradesh, Telangana, Karnataka |
| 6 | Southern Zone 2 | Tamil Nadu, Kerala, Puducherry, Lakshadweep |
| 7 | Eastern Zone 1 | West Bengal, Odisha, Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Tripura, Sikkim, Andaman & Nicobar |
| 8 | Eastern Zone 2 | Bihar, Jharkhand |
| 9 | Army Postal Service (APS) | Field Post Offices (FPO), 56 APO, and 99 APO for Indian Armed Forces personnel |
Types of Post Offices in India (GPO, HO, SO, BO)
In our directory of 157,126+ post offices, each facility has an administrative designation based on its operational capacity:
General Post Office (GPO)
The principal post office in a major metropolitan city or circle headquarters (e.g., Mumbai GPO, New Delhi GPO, Kolkata GPO). Manages the highest volume of Speed Post, foreign mail, and philately.
Head Post Office (HO)
The chief administrative office of a postal division. Regulates all financial accounts and subordinate post offices within the district.
Sub Post Office (SO)
Established in urban neighborhoods and commercial areas. Provides full postal, Speed Post booking, parcel dispatch, and savings bank services.
Branch Post Office (BO)
Operated in rural villages and remote settlements to ensure universal postal and banking access across all corners of India.
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