41 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 Frondizi | | |
| | AUSTRIA | (Vienna) | | President Adolf Schaerf | | |
| | AUSTRALIA | (Canberra) | | Queen Elizabeth II | | |
| | BELGIUM | (Brussels) | | King Baudoin I | | |
| | BULGARIA | (Sofia) | | Todor Zhivkov | | |
| | BRAZIL | (Brasilia) | | President Juscelino Kubitschek | | |
| | CANADA | (Ottawa) | | Queen Elizabeth II | | |
| | SWITZERLAND | (Berne lq + Lausanne j) | | President Max Petitpierre | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Jorge Alessandri | | |
| | CZECHOSLOVAKIA | (Prague a) | | Antonin Novotny | | |
| | WEST GERMANY | (Bonn ar + Karlsruhe d) | | Bundespresident Heinrich Luebke | | |
| | DENMARK | (Copenhagen) | | King Frederick IX | | |
| | DOMINICAN | (Ciudad Trujillo) | | Generalissimo Rafael Leonidas Trujillo | | |
| | ECUADOR | (San Francisco of Quito) | | President Jose Maria Velasco Ibarra | | |
| | SPAIN | (Madrid) | | Caudillo Francisco Franco | | |
| | FINLAND | (Helsinki a + Kultaranta s) | | President Urho Kekkonen | | |
| | FRANCE | (Paris) | | President Charles de Gaulle | | |
| | HUNGARY | (Budapest a) | | Janos Kadar | | |
| | INDONESIA | (Jakarta a + Bogor r + Chipanas r + Jogjakarta r + Tampaksiring r) | | President Ahmad Sukarno | | |
| | IRELAND | (Dublin) | | President Eamon de Valera | | |
| | INDIA | (New Delhi a + Simla s + Bolarum w) | | President Rajendra Prasad | | |
| | ITALY | (Rome a) | | President Giovanni Gronchi | | |
| | JAPAN | (Tokyo) | | Emperor Hirohito | | |
| | SOUTH KOREA | (Seoul a) | | President Yun Po-Sun | | |
| | MEXICO | (Mexico City) | | President Adolfo Lopez Mateos | | |
| | NICARAGUA | (Managua) | | President Luis Somoza Debayle | | |
| | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) | | Queen Juliana | | |
| | NORWAY | (Oslo) | | King Olav V | | |
| | PERU | (Lima) | | President Manuel Prado Ugarteche | | |
| | POLAND | (Warsaw a) | | Wladyslaw Gomulka | | |
| | PORTUGAL | (Lisbon) | | President Americo Thomaz | | |
| | RUMANIA | (Bucharest) | | Gheorghe Gheorghiu-Dej | | |
| | SWEDEN | (Stockholm) | | King Gustav VI Adolphe | | |
| | SOVIET UNION | (Moscow) | | Nikita Khrushchev | | |
| | EL SALVADOR | (San Salvador) | | President Jose Maria Lemus | | |
| | THAILAND | (Bangkok) | | King Rama IX Bhumibol Adulyadej | | |
| | TURKEY | (Ankara a) | | Cemal Gursel | | |
| | UNITED KINGDOM | (London a + Westminster lr + Edinburgh s + Windsor r) | | Queen Elizabeth II | | |
| | AMERICA | (Washington-District of Columbia) | | President Dwight David Eisenhower | | |
| | URUGUAY | (Montevideo) | | President Benito Nardone | | |
| | VENEZUELA | (Caracas) | | President Romulo Betancourt | | |