Explained: History of the PIN code, which turns 50 this Independence Day

It was on August 15, 1972, that the Postal Index Number (PIN) was introduced in India. As the PIN code turns 50, we look at its history and evolution.

The PIN code was meant to ease the process of mail sorting and delivery in a country where different places, often, have the same or similar names, and letters are written in a wide variety of languages. (Express)

The 75th Independence Day coincides with another milestone in the country’s history — it was on August 15, 1972, that the Postal Index Number (PIN) was introduced in India. As the PIN code turns 50 on Monday, we look at its history and evolution.

Why was the PIN code introduced?

According to the Department of Posts, there were 23,344 post offices, primarily in urban areas, in India at the time of Independence. But, the country was growing rapidly and the postal network had to keep pace.

How does the PIN code work?

The PIN is made up of six digits. The first number indicates the postal region — Northern, Eastern, Western, Southern; and number 9, which signifies the Army Postal Service. The second number denotes a sub-region, and the third represents the sorting district. The remaining numbers narrow the geography further to the specific post office making the delivery.

Who was the person behind the initiative?

The person behind the initiative was Shriram Bhikaji Velankar, additional secretary in the Union Ministry of Communications and a senior member of the Posts and Telegraphs Board.

Velankar was also a Sanskrit poet of eminence who had been conferred the President’s Award for Sanskrit in 1996, three years before he died in Mumbai. Among Velankar’s 105 books and plays in Sanskrit was the Viloma Kavya, which is considered a literary masterpiece because it comprises verses in praise of Lord Rama when read from one side and, when read backwards, it transformed into verses dedicated to Lord Krishna. Velankar had set up a cultural group in Mumbai, called the Dev Vani Mandiram, which worked to create awareness about Sanskrit in India and foreign countries. Velankar was also the chairman of the World Philatelic Exhibition, called Indipex, which was held in New Delhi in 1973 and featured 120 countries. He retired from his government service on December 31, 1973.

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What are some parallel systems followed world over?

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Globally, in the US, the Zone Improvement Plan (ZIP) code was introduced July 1, 1963, under the aegis of the Postal Service Nationwide Improved Mail Service plan to improve the speed of mail delivery. According to the Library of Congress, “Under the old system letters went through about 17 sorting stops – the new system was going to be considerably less time-consuming utilizing newer, more mechanical systems”.

In the UK, the sorting of mail started getting mechanised in the mid-1960s. “The key to mechanisation is an alphanumeric postal code that provides for sorting by machine at every stage of handling, including the carrier’s delivery route. The coding equipment translates the postal code into a pattern of dots by means of which machines can sort mail at eight times the speed of manual sorting,” informs Encyclopedia Britannica. Japan created its postal code address system in July 1968, and automatic postal code reader-sorters exist in major post offices of the country.

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Is the PIN code still relevant?

With the spread of the Internet, when people are sending fewer letters, it is easy to question the relevance of the PIN code.

But try to order a food delivery or a parcel over online shopping and the importance of Velankar’s work in India will become evident.

Dipanita Nath

Dipanita Nath is a Senior Assistant Editor at The Indian Express, based in Pune. She is a versatile journalist with a deep interest in the intersection of culture, sustainability, and urban life. Professional Background Experience: Before joining The Indian Express, she worked with other major news organizations including Hindustan Times, The Times of India, and Mint. Core Specializations: She is widely recognized for her coverage of the climate crisis, theatre and performing arts, heritage conservation, and the startup ecosystem (often through her "Pune Inc" series). Storytelling Focus: Her work often unearths "hidden stories" of Pune—focusing on historical institutes, local traditions, and the personal journeys of social innovators. Recent Notable Articles (December 2025) Her recent reporting highlights Pune’s cultural pulse and the environmental challenges facing the city during the winter season: 1. Climate & Environment "Pune shivers on coldest morning of the season; minimum temperature plunges to 6.9°C" (Dec 20, 2025): Reporting on the record-breaking cold wave in Pune and the IMD's forecast for the week. "How a heritage tree-mapping event at Ganeshkhind Garden highlights rising interest in Pune’s green legacy" (Dec 20, 2025): Covering a citizen-led initiative where Gen Z and millennials gathered to document and protect ancient trees at a Biodiversity Heritage Site. "Right to breathe: Landmark NGT order directs PMC to frame norms for pollution from construction sites" (Dec 8, 2025): Reporting on a significant legal victory for residents fighting dust and air pollution in urban neighborhoods like Baner. 2. "Hidden Stories" & Heritage "Inside Pune library that’s nourished minds of entrepreneurs for 17 years" (Dec 21, 2025): A feature on the Venture Center Library, detailing how a collection of 3,500 specialized books helps tech startups navigate the product life cycle. "Before he died, Ram Sutar gave Pune a lasting gift" (Dec 18, 2025): A tribute to the legendary sculptor Ram Sutar (creator of the Statue of Unity), focusing on his local works like the Chhatrapati Shivaji statue at Pune airport. "The Pune institute where MA Jinnah was once chief guest" (Dec 6, 2025): An archival exploration of the College of Agriculture, established in 1907, and its historical role in India's freedom struggle. 3. Arts, Theatre & "Pune Inc" "Satyajit Ray, Ritwik Ghatak were not rivals but close friends, says veteran filmmaker" (Dec 17, 2025): A deep-dive interview ahead of the Pune International Film Festival (PIFF) exploring the camaraderie between legends of Indian cinema. "Meet the Pune entrepreneur helping women build and scale businesses" (Dec 16, 2025): Part of her "Pune Inc" series, profiling Nikita Vora’s efforts to empower female-led startups. "How women drone pilots in rural Maharashtra are cultivating a green habit" (Dec 12, 2025): Exploring how technology is being used by women in agriculture to reduce chemical use and labor. Signature Style Dipanita Nath is known for intellectual curiosity and a narrative-driven approach. Whether she is writing about a 110-year-old eatery or the intricacies of the climate crisis, she focuses on the human element and the historical context. Her columns are often a blend of reportage and cultural commentary, making them a staple for readers interested in the "soul" of Pune. X (Twitter): @dipanitanath ... Read More