24 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 Juan Peron |  | |
 |  | BOLIVIA | (Sucre cj + La Paz eir) |  | President Victor Paz Estenssoro | | |
 |  | BRAZIL | (Rio de Janeiro) |  | President Joao Fernandes de Campos Cafe Filho | | |
 |  | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) |  | President Carlos Ibanez del Campo | | |
 |  | COLOMBIA | (Bogota) |  | President Gustavo Rojas Pinilla | | |
 |  | COSTA RICA | (San Jose) |  | President Jose Figueres Ferrer |  | |
 |  | CUBA | (Havana) |  | Fulgencio Batista | | |
 |  | DOMINICAN | (Ciudad Trujillo) |  | Generalissimo Rafael Leonidas Trujillo | | |
 |  | ECUADOR | (San Francisco of Quito) |  | President Jose Maria Velasco Ibarra | | |
 |  | FRENCH UNION | (Paris) |  | President Rene Coty |  | |
 |  | GUATEMALA | (Guatemala City) |  | Carlos Castillo Armas | | |
 |  | HONDURAS | (Tegucigalpa a + Comayaguela c) |  | Julio Lozano Diaz | | |
 |  | HAITI | (Port Au Prince) |  | President Nemours Pierre-Louis | | |
 |  | MEXICO | (Mexico City) |  | President Adolfo Ruiz Cortines | | |
 |  | NICARAGUA | (Managua) |  | President Anastasio Somoza Garcia | | |
 |  | NETHERLANDS | (Amsterdam a + The Hague jlr + Wassenaar r) |  | Queen Juliana | | |
 |  | PANAMA | (Panama City) |  | President Jose Antonio Remon Cantera | | |
 |  | PERU | (Lima) |  | President Manuel Arturo Odria | | |
 |  | PARAGUAY | (Assumption) |  | President Alfredo Stroessner | | |
 |  | EL SALVADOR | (San Salvador) |  | President Oscar Osorio | | |
 |  | 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 Andres Martinez Trueba | | |
 |  | VENEZUELA | (Caracas) |  | President Marcos Perez Jimenez | | |
