29 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 Arturo Umberto Illia | | |
| | AUSTRIA | (Vienna) | | President Adolf Schaerf | | |
| | AUSTRALIA | (Canberra) | | Queen Elizabeth II | | |
| | BELGIUM | (Brussels) | | King Baudoin I | | |
| | BOLIVIA | (Sucre cj + La Paz eir) | | Rene Barrientos | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Ludwig von Moos | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Eduardo Frei Montalva | | |
| | COLOMBIA | (Bogota) | | President Guillermo Leon Valencia | | |
| | COSTA RICA | (San Jose) | | President Francisco Jose Orlich Bolmarich | | |
| | WEST GERMANY | (Bonn ar + Karlsruhe d) | | Bundespresident Heinrich Luebke | | |
| | DENMARK | (Copenhagen) | | King Frederick IX | | |
| | ECUADOR | (San Francisco of Quito) | | Ramon Castro Jijon | | |
| | SPAIN | (Madrid) | | Caudillo Francisco Franco | | |
| | FRANCE | (Paris) | | President Charles de Gaulle | | |
| | GREECE | (Athens a) | | King Constantine II | | |
| | ISRAEL | (West Jerusalem qu + Tel Aviv-Jaffa i) | | 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 | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | Queen Juliana | | |
| | NORWAY | (Oslo) | | King Olav V | | |
| | NEW ZEALAND | (Wellington) | | Queen Elizabeth II | | |
| | PANAMA | (Panama City) | | President Marco Aurelio Robles | | |
| | PARAGUAY | (Assumption) | | President Alfredo Stroessner | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Lyndon Baines Johnson | | |
| | VENEZUELA | (Caracas) | | President Raul Leoni | | |
| | SOUTH AFRICA | (Pretoria ae + Cape Town l + Bloemfontein j) | | State President Charles Robberts Swart | | |
| | RHODESIA | (Salisbury) | | | | |