This package contains a datatype that allows a user to select one or more countries from a listbox and it will store the associated ISO2 codes (ISO 3166-1 Alpha-2).
If you don't require ISO2 codes to be stored, you definitely want to check out the country picker data type included within uComponents instead: http://our.umbraco.org/projects/backoffice-extensions/ucomponents
Installation Requirements
Package Contents
Change Log
Filters are configured through a specific format (check out the 3rd screenshot to see how it's done).
Countries & ISO2 codes exported from: http://www.iso.org/iso/country_codes/iso_3166_code_lists.htm