United States Postal Service (USPS)
Zip Code Finder
Mail Rate Calculator
FedEx / UPS / DHL
Click on the drop-down menu to view standard abbreviations for states and U.S. Possessions. (U.S. possessions are considered domestic (same postage as the states.)
Miscellaneous Postal Abbreviations
Click on the drop-down menu to view miscellaneous postal abbreviations.