This is a text-based list of the entities with a "country data code" per the CIA Factbook (which itself is a great resource for all sorts of interesting information).
Afghanistan Akrotiri Albania Algeria American Samoa Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Ashmore and Cartier Islands Australia Austria Azerbaijan Bahamas, The Bahrain Baker Island Bangladesh Barbados Bassas da India Belarus Belgium Belize Benin Bermuda Bhutan Bolivia Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory British Virgin Islands Brunei Bulgaria Burkina Faso Burma Burundi Cabo Verde Cambodia Cameroon Canada Cayman Islands Central African Republic Chad Chile China Christmas Island Clipperton Island Cocos (Keeling) Islands Colombia Comoros Congo, Democratic Republic of the Congo, Republic of the Cook Islands Coral Sea Islands Costa Rica Cote d'Ivoire Croatia Cuba Curacao Cyprus Czech Republic Denmark Dhekelia Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Europa Island Falkland Islands (Islas Malvinas) Faroe Islands Fiji Finland France France, Metropolitan French Guiana French Polynesia French Southern and Antarctic Lands Gabon Gambia, The Gaza Strip Georgia Germany Ghana Gibraltar Glorioso Islands Greece Greenland Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City) Honduras Hong Kong Howland Island Hungary Iceland India Indonesia Iran Iraq Ireland Isle of Man Israel Italy Jamaica Jan Mayen Japan Jarvis Island Jersey Johnston Atoll Jordan Juan de Nova Island Kazakhstan Kenya Kingman Reef Kiribati Korea, North Korea, South Kosovo Kuwait Kyrgyzstan Laos Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Luxembourg Macau Macedonia Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Micronesia, Federated States of Midway Islands Moldova Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Navassa Island Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Northern Mariana Islands Norway Oman Pakistan Palau Palmyra Atoll Panama Papua New Guinea Paracel Islands Paraguay Peru Philippines Pitcairn Islands Poland Portugal Puerto Rico Qatar Reunion Romania Russia Rwanda Saint Barthelemy Saint Helena, Ascension, and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the Islands South Sudan Spain Spratly Islands Sri Lanka Sudan Suriname Svalbard Swaziland Sweden Switzerland Syria Taiwan Tajikistan Tanzania Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tromelin Island Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States United States Minor Outlying Islands Uruguay Uzbekistan Vanuatu Venezuela Vietnam Virgin Islands Virgin Islands (UK) Virgin Islands (US) Wake Island Wallis and Futuna West Bank Western Sahara Western Samoa Yemen Zaire Zambia Zimbabwe