Free and almost free GPS POI Files - Interactive POI Database
GPS POI for the United States (Change country)
POI Category: Postcodes in the United States (Change POI category)
|| - Here you can browse, search, map, see satellite image and download co-ordinates. USA ZIP codes POI file for Garmin GPS units.
|United States Postal Service
|| - At the United States Postal Service (USPS) you can sort out address changes, alternate mail access, boxing and packaging, bulk mail service, business tools, carrier pickup. They offer dropoff locations,
gift cards with greeting cards, facility access & shipment tracking (FAST), mail forwarding, tracking & reporting, mailboxes, maps (ZIP Code/Carrier Route Maps), publications, etc.