Why ZIP codes have 5 numbers — and what they each mean. | Business Insider

4.7K views · 36 reactions | 50 years ago Australia adopted the 4 digit postcode system and we began our journey as an education provider. While we now support a global network of students and alumni, we’re proud to have sustained the community values that originated 50 years ago in the 4350 postcode. Find out more: https://www.usq.edu.au/50-25 | University of Southern Queensland - Australia | Facebook

55K views · 340 reactions | #OnThisDay 1959: Norwich became the first place in the UK to get a new six-digit postcode. | BBC Archive | Facebook

The postcode is celebrating its anniversary! 🎊 Almost like Swiss Post – except it’s turning 60, not 175 years old. The postcode was introduced in 1964, following the launch of a letter sorting machine at the time designed to handle increasing order volumes and compensate for staff shortages. 💌📬 To ensure that the sorting machine worked properly, a numbering system was required – and the postcode was born. But what do the different numbers mean? 🤔 We’ll tell you more! #YellowHistory175 | Swis