text: OpenStreetMap doesn't provide an address validation service. And (as in here), there often isn't zip code information in the OpenStreetMap database anyway. Whatever app you were using might have been showing you a map based on OpenStreetMap, but validating the address with some other service. If you're having trouble getting an app to validate your address and zip code, then you need to contact that app. Maybe they can tell you what service they're using to validate addresses. There isn't anything for OpenStreetMap to do to help you.