30 Members (excluding the associate or suspended members but including the countries represented on their behalf) [The rulers are not necessarily the representatives in the organisation. ] :
| | ARGENTINE | (Buenos Aires a + Olivos r) | | President Roberto Marcelo Levingston | | |
| | AUSTRIA | (Vienna) | | President Franz Jonas | | |
| | AUSTRALIA | (Canberra) | | Queen Elizabeth II | | |
| | BELGIUM | (Brussels) | | King Baudoin I | | |
| | BOLIVIA | (Sucre cj + La Paz eir) | | President Juan Jose Torres | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Rudolf Gnaegi | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Salvador Allende | | |
| | COLOMBIA | (Bogota) | | President Misael Pastrana Borrero | | |
| | COSTA RICA | (San Jose) | | President Jose Figueres Ferrer | | |
| | WEST GERMANY | (Bonn ar + Karlsruhe d) | | Bundespresident Gustav Heinemann | | |
| | DENMARK | (Copenhagen) | | King Frederick IX | | |
| | DOMINICAN | (Santo Domingo de Guzman) | | President Joaquin Balaguer | | |
| | ECUADOR | (San Francisco of Quito) | | President Jose Maria Velasco Ibarra | | |
| | SPAIN | (Madrid) | | Caudillo Francisco Franco | | |
| | GREECE | (Athens a) | | Regent George Zoitakis | | |
| | HONDURAS | (Tegucigalpa a + Comayaguela c) | | President Oswaldo Lopez Arellano | | |
| | ISRAEL | (West Jerusalem qru + Tel Aviv-Jaffa in) | | President Zalman Shazar | | |
| | ITALY | (Rome a) | | President Giuseppe Saragat | | |
| | LUXEMBOURG | (Luxembourg a) | | Grand Duke Jean | | |
| | MALTA | (Valletta a + Attard r + Siggiewi s) | | Sir Maurice Henry Dorman | | |
| | NICARAGUA | (Managua) | | President Anastasio Somoza Debayle | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | Queen Juliana | | |
| | NORWAY | (Oslo) | | King Olav V | | |
| | PANAMA | (Panama City) | | General Omar Torrijos Herrera | | |
| | PERU | (Lima) | | President Juan Velasco Alvarado | | |
| | PARAGUAY | (Assumption) | | President Alfredo Stroessner | | |
| | EL SALVADOR | (San Salvador) | | President Fidel Sanchez Hernandez | | |
| | AMERICA | (Washington-District of Columbia) | | President Richard Nixon | | |
| | URUGUAY | (Montevideo) | | President Jorge Pacheco Areco | | |
| | SOUTH AFRICA | (Pretoria ae + Cape Town l + Bloemfontein j) | | State President Jacobus Johannes Fouche | | |