If your customers reside in multiple countries, you may want to define the Country Code which can be added to address labels.
Go to Maintenance: Definitions: Countries.
The only country listed will be USA, but you may choose to add additional countries by choosing the Add button if you only work with a few countries..
Check the option "Add To Shipping Label" so that the country code will be included on the label.
Import List - To add all country codes, choose the Import button.
See more definitions