18 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 Reynaldo Bignone | | |
| | BOLIVIA | (Sucre cj + La Paz eir) | | President Hernan Siles Zuazo | | |
| | BRAZIL | (Brasilia) | | President Joao Figueiredo | | |
| | COLOMBIA | (Bogota) | | President Belisario Betancur | | |
| | COSTA RICA | (San Jose) | | President Luis Alberto Monge Alvarez | | |
| | CUBA | (Havana) | | Supreme Leader Fidel Castro | | |
| | DOMINICAN | (Santo Domingo de Guzman) | | President Salvador Jorge Blanco | | |
| | ECUADOR | (San Francisco of Quito) | | President Osvaldo Hurtado Larrea | | |
| | GUATEMALA | (Guatemala City) | | President Efrain Rios Montt | | |
| | HONDURAS | (Tegucigalpa a + Comayaguela c) | | President Roberto Suazo Cordova | | |
| | MEXICO | (Mexico City) | | President Miguel de la Madrid Hurtado | | |
| | NICARAGUA | (Managua) | | Daniel Ortega | | |
| | PANAMA | (Panama City) | | General Ruben Dario Paredes | | |
| | PERU | (Lima a + Arequipa d) | | President Fernando Belaunde Terry | | |
| | PARAGUAY | (Assumption) | | President Alfredo Stroessner | | |
| | EL SALVADOR | (San Salvador) | | President Alvaro Magana | | |
| | URUGUAY | (Montevideo) | | President Gregorio Conrado Alvarez Armelino | | |
| | VENEZUELA | (Caracas) | | President Luis Herrera Campins | | |