Did you ever stop to think about the reason behind the ZIP code system, and why the kids from Beverly Hills lived in the 90210 area and you didn't? Well, with evolution came the need for a more complete geographical coding system. So zip codes were created to facilitate the United States' mail delivery. The ZIP (Zone Improvement Plan) is a 5-digit code that marks a specific geographical region in the US. Made up of three …showed first 75 words of 641 total…

…showed last 75 words of 641 total…need to have a package delivered to a remote area in Sioux City, Iowa. Then remind yourself that someone out there knows exactly where to drop off your letters. So now that you have a better understanding of the what, when and where of zip codes, aren't you glad you'll be able to impress your peers at a party? If not, at least the kid down the street will think you're a useless trivia expert.