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 Jorge Rafael Videla | | |
| | BOLIVIA | (Sucre cj + La Paz eir) | | Lydia Gueiler Tejada | | |
| | BRAZIL | (Brasilia) | | President Joao Figueiredo | | |
| | CHILE | (Santiago of Chile a + Vina del Mar s) | | General Augusto Pinochet | | |
| | COLOMBIA | (Bogota) | | President Julio Cesar Turbay Ayala | | |
| | COSTA RICA | (San Jose) | | President Rodrigo Carazo Odio | | |
| | DOMINICAN | (Santo Domingo de Guzman) | | President Antonio Guzman Fernandez | | |
| | ECUADOR | (San Francisco of Quito) | | President Jaime Roldos Aguilera | | |
| | GUATEMALA | (Guatemala City) | | President Fernando Romeo Lucas Garcia | | |
| | HONDURAS | (Tegucigalpa a + Comayaguela c) | | Policarpo Paz Garcia | | |
| | HAITI | (Port Au Prince) | | President Jean-Claude Duvalier Baby Doc | | |
| | MEXICO | (Mexico City) | | President Jose Lopez Portillo | | |
| | NICARAGUA | (Managua) | | Daniel Ortega | | |
| | PANAMA | (Panama City) | | Supreme Leader General Omar Torrijos Herrera | | |
| | PERU | (Lima a + Arequipa d) | | President General Francisco Morales Bermudez | | |
| | PARAGUAY | (Assumption) | | President Alfredo Stroessner | | |
| | EL SALVADOR | (San Salvador) | | Adolfo Majano Ramos | | |
| | TRINIDAD AND TOBAGO | (Port-of-Spain) | | President Sir Ellis Clarke | | |
| | AMERICA | (Washington-District of Columbia) | | President Jimmy Carter | | |
| | URUGUAY | (Montevideo) | | President Aparicio Mendez | | |
| | VENEZUELA | (Caracas) | | President Luis Herrera Campins | | |