310K views · 2.1K reactions | Why ZIP codes have 5 numbers — and what they each mean. | Business Insider | Facebook

When ZIP codes were introduced in 1963, they quietly revolutionized how America sent and received mail 📬. Before that, postal workers had to rely on local knowledge and often got stuck with confusing street names or rapidly growing neighborhoods. The Zone Improvement Plan (ZIP) changed everything, giving every address a neat five-digit code. Sorting sped up. Deliveries got faster. Chaos turned into order. But here’s the twist what began as a practical fix soon became a cultural marker. ZIP code