Like our social security numbers, birth dates, and phone numbers, our ZIP codes are one of many seemingly random number sequences etched in our minds. But, for the most part, the only people who know ...

Mr. Zip, a gangly cartoonish figure with wide friendly eyes and a neat blue mail carrier's uniform, emerged fifty years ago to help the U.S. Postal Service promote its newest idea: five numbers added ...

Before e-mail or cellphones or even the fax machine came a revolutionary advance in how people get information to the right destination: the ZIP code. Fifty years ago this week, the U.S. Postal ...