Usps zip code lookup by address errors are delaying shipments
Unfortunately, I have not been able to find a USPS Web site which states this clearly, and so for the moment will refer to this Web page by another source (which has links to USPS Web pages which are no longer active ). USA Today: What is a postal code? Here's what the five-digit number means.
Cracking The Code: Mastering USPS ZIP Code Lookup For Effortless Mailing
