In your store's Admin area, go to the System > Localization > Go to the System → Localization → Countries
Use this section to manage the set of countries that are supported in your store. Countries are used to define Location.
To refuse orders from certain countries and remove them from the customer registration's drop-down list, select status to OFF.
To add a new Country click the + button
Adding or editing country
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.
Address Format used for Invoice's shipping and payment addresses display.