Recognized as states by the US
AF Islamic State of Afghanistan AL Republic of Albania AG Democratic and Popular Republic of Algeria AN Principality of Andorra AO Republic of Angola AC Antigua and Barbuda AR Argentine Republic AM Republic of Armenia AS Commonwealth of Australia AU Republic of Austria AJ Republic of Azerbaijan BF Commonwealth of The Bahamas BA State of Bahrain BG People's Republic of Bangladesh BB Barbados BO Republic of Belarus BE Kingdom of Belgium BH Belize BN Republic of Benin BT Kingdom of Bhutan BL Republic of Bolivia BK Bosnia and Herzegovina BC Republic of Botswana BR Federative Republic of Brazil BX Negara Brunei Darussalam BU Republic of Bulgaria UV Burkina Faso BM Union of Burma BY Republic of Burundi CB Kingdom of Cambodia CM Republic of Cameroon CA Canada CV Republic of Cape Verde CT Central African Republic CD Republic of Chad CI Republic of Chile CH People's Republic of China CO Republic of Colombia CN Federal Islamic Republic of the Comoros CF Republic of the Congo CG Democratic Republic of the Congo CS Republic of Costa Rica IV Republic of Cote d'Ivoire HR Republic of Croatia CU Republic of Cuba CY Republic of Cyprus EZ Czech Republic DA Kingdom of Denmark DJ Republic of Djibouti DO Commonwealth of Dominica DR Dominican Republic EC Republic of Ecuador EG Arab Republic of Egypt ES Republic of El Salvador EK Republic of Equatorial Guinea ER State of Eritrea EN Republic of Estonia ET Federal Democratic Republic of Ethiopia FJ Republic of the Fiji Islands FI Republic of Finland FR French Republic GB Gabonese Republic GA Republic of The Gambia GG Republic of Georgia GM Federal Republic of Germany GH Republic of Ghana GR Hellenic Republic GJ Grenada GT Republic of Guatemala GV Republic of Guinea PU Republic of Guinea-Bissau GY Co-operative Republic of Guyana HA Republic of Haiti VT Holy See HO Republic of Honduras HU Republic of Hungary IC Republic of Iceland IN Republic of India ID Republic of Indonesia IR Islamic Republic of Iran IZ Republic of Iraq EI Ireland IS State of Israel IT Italian Republic JM Jamaica JA Japan JO Hashemite Kingdom of Jordan KZ Republic of Kazakhstan KE Republic of Kenya KR Republic of Kiribati KN Democratic People's Republic of Korea KS Republic of Korea KU State of Kuwait KG Kyrgyz Republic LA Lao People's Democratic Republic LG Republic of Latvia LE Lebanese Republic LT Kingdom of Lesotho LI Republic of Liberia LY Great Socialist People's Libyan Arab Jamahiriya LS Principality of Liechtenstein LH Republic of Lithuania LU Grand Duchy of Luxembourg MK The Former Yugoslav Republic of Macedonia MA Republic of Madagascar MI Republic of Malawi MY Malaysia MV Republic of Maldives ML Republic of Mali MT Republic of Malta RM Republic of the Marshall Islands MR Islamic Republic of Mauritania MP Republic of Mauritius MX United Mexican States FM Federated States of Micronesia MD Republic of Moldova MN Principality of Monaco MG Mongolia MO Kingdom of Morocco MZ Republic of Mozambique WA Republic of Namibia NR Republic of Nauru NP Kingdom of Nepal NL Kingdom of the Netherlands NZ New Zealand NU Republic of Nicaragua NG Republic of Niger NI Federal Republic of Nigeria NO Kingdom of Norway MU Sultanate of Oman PK Islamic Republic of Pakistan PS Republic of Palau PM Republic of Panama PP Independent State of Papua New Guinea PA Republic of Paraguay PE Republic of Peru RP Republic of the Philippines PL Republic of Poland PO Portuguese Republic QA State of Qatar RO Romania RS Russian Federation RW Rwandese Republic SC Federation of Saint Kitts and Nevis ST Saint Lucia VC Saint Vincent and the Grenadines WS Independent State of Samoa SM Republic of San Marino TP Democratic Republic of Sao Tome and Principe SA Kingdom of Saudi Arabia SG Republic of Senegal SE Republic of Seychelles SL Republic of Sierra Leone SN Republic of Singapore LO Slovak Republic SI Republic of Slovenia BP Solomon Islands SO Somalia SF Republic of South Africa SP Kingdom of Spain CE Democratic Socialist Republic of Sri Lanka SU Republic of the Sudan NS Republic of Suriname WZ Kingdom of Swaziland SW Kingdom of Sweden SZ Swiss Confederation SY Syrian Arab Republic TI Republic of Tajikistan TZ United Republic of Tanzania TH Kingdom of Thailand TO Togolese Republic TN Kingdom of Tonga TD Republic of Trinidad and Tobago TS Republic of Tunisia TU Republic of Turkey TX Turkmenistan TV Tuvalu UG Republic of Uganda UP Ukraine TC United Arab Emirates UK United Kingdom of Great Britain and Northern Ireland US United States of America UY Oriental Republic of Uruguay UZ Republic of Uzbekistan NH Republic of Vanuatu VE Bolivarian Republic of Venezuela VM Socialist Republic of Vietnam YM Republic of Yemen YI Federal Republic of Yugoslavia ZA Republic of Zambia ZI Republic of Zimbabwe
Other
TW Taiwan
Source: http://www.state.gov/www/regions/independent_states.html