Country Codes Split List
A quick reference to both Internet country codes and international dialing codes for countries around the world.
Electronic Mail Internet Country Codes
Alphabetical list of the country codes used in email and World Wide Web addresses to indicate sites that come from specific countries.
ISO 3166 Codes (Countries)
List of the codes the ISO uses to indicate countries in Internet addresses or online data communications.
Wikipedia: Country Code
Encyclopedia article about the different kinds of country codes used to represent countries and geographic areas on the Internet, in data processing, and for networked communication.