UnitedStatesZIPCode.org has printable maps of all 50 states with ZIP codes. Further, the site provides a downloadable database of all United States ZIP codes. As of 2015, the site's ZIP code data comes from the United States Postal Service, U.S. Census Bureau, the Internal Revenue Service and Yahoo.
The website also includes a shipping calculator. Enter the ZIP codes of a package's current location and its destination. The results display rates for UPS, FedEx and the United States Postal Service for each size package and for specific delivery dates.Learn more about Postal Services