ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP is an acronym for Zone Improvement Plan. All U.S. addresses have a standard five-digit ...

Norfolk, Va. – Effective immediately, anyone sending mail to Navy mobile units must use a nine-digit ZIP code to ensure delivery, according to a message released by Secretary of the Navy Ray ...

One item alone – the 9-digit ZIP code, with 90 percent compliance for presorted first-class mail – was expected to save $900 million, a good bit more than the projected deficit for this year.

The 54915 ZIP code can indicate Calumet and Outagamie counties, which have a 0.5% sales tax, but also Winnebago County, which doesn't have the tax.