21 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 Mamerto Urriolagoitia | | |
 |  | BRAZIL | (Rio de Janeiro) |  | President Eurico Gaspar Dutra | | |
 |  | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) |  | President Gabriel Gonzalez Videla | | |
 |  | COLOMBIA | (Bogota) |  | President Mariano Ospina Perez | | |
 |  | COSTA RICA | (San Jose) |  | President Luis Emilio Rafael de la Trinidad |  | |
 |  | CUBA | (Havana) |  | President Carlos Prio Socarras | | |
 |  | DOMINICAN | (Ciudad Trujillo) |  | President Generalissimo Rafael Leonidas Trujillo | | |
 |  | ECUADOR | (San Francisco of Quito) |  | President Galo Plaza Lasso | | |
 |  | GUATEMALA | (Guatemala City) |  | President Juan Jose Arevalo | | |
 |  | HONDURAS | (Tegucigalpa a + Comayaguela c) |  | President Juan Manuel Galvez | | |
 |  | HAITI | (Port Au Prince) |  | President Franck Lavaud | | |
 |  | MEXICO | (Mexico City) |  | President Miguel Aleman Valdez | | |
 |  | NICARAGUA | (Managua) |  | President Anastasio Somoza Garcia | | |
 |  | PANAMA | (Panama City) |  | President Arnulfo Arias Madrid | | |
 |  | PERU | (Lima) |  | Manuel Arturo Odria | | |
 |  | PARAGUAY | (Assumption) |  | President Federico Chaves | | |
 |  | EL SALVADOR | (San Salvador) |  | Revolutionary Council of Government | | |
 |  | AMERICA | (Washington-District of Columbia) |  | President Harry Truman | | |
 |  | URUGUAY | (Montevideo) |  | President Luis Batlle Berres | | |
 |  | VENEZUELA | (Caracas) |  | Carlos Delgado Chalbaud | | |
