Adding or editing country
In your store's Admin area, go to the System > Localization > Counries.
Country Name: Name of the country.
ISO Code (2): The 2 letter ISO country code. You can find out more about these here.
ISO Code (3): The 3 letter ISO country code. You can find out more about these here.
Address Format: You can define the address formatting for each country.
Each part of the address format must contained within a curly bracket.
After you have made your changes, click save button
Address Format used for Invoice's shipping and payment addresses display.