Nations Online website has some Very nice lists of standard International Country related Codes for the world!
Nations Online ... some codes for the world
Signs of the Times
Acronyms and numbers, alpha numeric and numeric codes connect the world.
International Country related Codes
International codes list.
On this page you'll find lists of some of the most often used codes with their meanings.
International Airport Codes
Listings of IATA 3 letter codes for airports and cities around the world.
International Country Codes
This listing contains the two letter code (ISO alpha-2) and the three letter code (ISO alpha-3) as well as the FIPS 10-4 code for countries, dependencies, and other areas of particular geopolitical interest.
International Currencies and Currency Codes
Official currencies around the world. Up to date list of currency names, 3 character alphabetic and 3 digit numeric ISO 4217 codes for each country.
International Country Calling Codes
List of Country Calling Codes and the International Dialing Prefix (IDD) for international phone calls.
International Languages Codes
List of English and French Language names with ISO 639-2 Alpha-3 as well as some of the Alpha-2 codes arranged alphabetically by English name of language.
International Spelling Alphabet Codes
Phonetic alphabet list of international spelling alphabet codes.
One World - Nations Online .:. let's care for this planet
Made to improve cross-cultural understanding and global awareness.
http://www.nationsonline.org/oneworld/codes.html