The familiar five-digit number was part of a nationwide effort to modernize the mail.
Hanna Horvath is a CERTIFIED FINANCIAL PLANNERâ„¢ and Red Venture's senior editor of content partnerships. Fox Money is a personal finance hub featuring content generated by Credible Operations, Inc.
Add Yahoo as a preferred source to see more of our stories on Google. Most Americans know their ZIP code by heart. They type it into online forms, scribble it on envelopes and memorize it as part of ...