| AA | | Vatican | - |
| AB | | Albania | - |
| AC | | Germany | 5 |
| AD | | Angola | - |
| AE | | Saudi Arabia | - |
| AF | | Algeria | 2 |
| AG | | Armenia | 1 |
| AH | | Australia | 1 |
| AI | | Austria | 3 |
| AJ | | Belarus | - |
| AK | | Belgium | - |
| AL | | Bolivia | 2 |
| AM | | Brazil | 1 |
| AN | | Bulgaria | - |
| AO | | Canada | 6 |
| AP | | Czech Republic | 2 |
| AQ | | Chile | - |
| AR | | People's Republic of China | 2 |
| AS | | Colombia | - |
| AT | | Democratic Republic of Congo | - |
| AU | | Republic of Korea | 3 |
| AV | | Costa Rica | - |
| AW | | Croatia | - |
| AX | | Cuba | 1 |
| AY | | Denmark | - |
| AZ | | Dominican Republic | - |
| BA | | Ecuador | - |
| BB | | Egypt | 1 |
| BC | | El Salvador | - |
| BD | | United Arab Emirates | - |
| BE | | Slovakia | - |
| BF | | Slovenia | - |
| BG | | Spain | 4 |
| BH | | United States of America | 31 |
| BI | | Philippines | - |
| BJ | | Finland | 1 |
| BK | | France | 1 |
| BL | | Greece | - |
| BM | | Guatemala | - |
| BN | | Haiti | 1 |
| BO | | Honduras | - |
| BP | | Hungary | 1 |
| BQ | | India | - |
| BR | | Indonesia | 5 |
| BS | | Iran | 1 |
| BT | | Ireland | - |
| BU | | Israel | - |
| BV | | Italy | 1 |
| BW | | Japan | - |
| BX | | Kuwait | 2 |
| BY | | Lebanon | - |
| BZ | | Libya | - |
| CA | | Lithuania | - |
| CB | | Malaysia | - |
| CC | | Sovereign Military Order of Malta | 1 |
| CD | | Morocco | - |
| CE | | Mexico | 3 |
| CF | | Nicaragua | - |
| CG | | Nigeria | - |
| CH | | Norway | - |
| CI | | New Zealand | - |
| CJ | | Netherlands | - |
| CK | | Pakistan | - |
| CL | | Panama | 2 |
| CM | | Paraguay | - |
| CN | | Peru | 1 |
| CO | | Poland | - |
| CP | | Portugal | 1 |
| CQ | | United Kingdom | 3 |
| CR | | Romania | - |
| CS | | Russia | 4 |
| CT | | San Marino | - |
| CU | | Serbia | - |
| CV | | Syria | - |
| CW | | South African Republic | - |
| CX | | Sweden | - |
| CY | | Switzerland | 1 |
| CZ | | Thailand | - |
| DA | | Tunisia | - |
| DB | | Turkey | 1 |
| DC | | Ukraine | - |
| DD | | Uruguay | 1 |
| DE | | Venezuela | - |
| DF | | Vietnam | 3 |
| DG | | European Union (EU) | - |
| DH | | League of Arab States | 1 |
| DI | | Palestinian National Authority | 1 |
| DJ | | Azerbaijan | - |
| DK | | | 1 |
| DL | | | - |
| DM | | | - |
| DN | | | - |
| DO | | | 1 |
| RA | | UN High Commissioner for Refugees (UNHCR) | - |
| RB | | Inter-American Development Bank | - |
| RC | | World Bank | - |
| RD | | Information center of the United Nations | - |
| RE | | Administrative Commission for the Río de la Plata | 1 |
| RF | | Administrative Commission for the Uruguay River | - |
| RG | | River Paraná Joint Commission | - |
| RH | | International Committee of the Red Cross (ICRC) | - |
| RI | | Latin American development bank | 1 |
| RJ | | International Finance Corporation | - |
| RK | | Yacyretá Binational Entity | - |
| RL | | United Nations International Children's Fund (UNICEF) | - |
| RM | | International Monetary Fund (IMF) | - |
| RN | | Inter-American Institute for Cooperation on Agriculture | - |
| RO | | Organization of Ibero-American States for Education, Science and Culture | - |
| RP | | Food and Agriculture Organization of the United Nations | - |
| RQ | | Ibero-American Social Security Organization | - |
| RR | | International Criminal Police Organization (ICPO-INTERPOL) | - |
| RS | | International Labour Organization | - |
| RT | | International Organization for Migration (IOM) | - |
| RU | | Pan American Health Organization | - |
| RV | | Joint United Nations Programme on HIV/AIDS | - |
| RW | | United Nations (UN) | - |
| RX | | Organization of American States | - |
| RY | | Secretariat of the Antarctic Treaty | - |
| XA | | Japan International Cooperation Agency | - |
| XB | | Konrad Adenauer Foundation | - |
| XC | | Hanns Seidel Foundation | - |
| XD | | Friedrich Naumann Foundation | - |
| XE | | Friedrich Ebert Foundation | - |