Question: My son is insisting that I can send him postcards to his name and 9-digit ZIP code, with no street address included. I don’t believe him. What’s the story and how do ZIP+4 ZIP codes work?

Forbes contributors publish independent expert analyses and insights. I cover real estate, economics and cost of living. Sep 20, 2023, 12:43pm EDT This article is more than 2 years old. Fisher Island ...