17 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 Mauricio Macri | | |
| | BRAZIL | (Brasilia) | | President Michel Temer | | |
| | THE BAHAMAS | (Nassau) | | Queen Elizabeth II | | |
| | CHILE | (Santiago of Chile a + Valparaiso l + Vina del Mar s) | | President Sebastian Pinera | | |
| | COLOMBIA | (Bogota) | | President Juan Manuel Santos | | |
| | COSTA RICA | (San Jose) | | President Carlos Alvarado Quesada | | |
| | DOMINICAN | (Santo Domingo de Guzman) | | President Danilo Medina | | |
| | GUATEMALA | (Guatemala City) | | President Jimmy Morales Cabrera | | |
| | HONDURAS | (Tegucigalpa a + Comayaguela c) | | President Juan Orlando Hernandez | | |
| | HAITI | (Port Au Prince) | | President Jovenel Moise | | |
| | PANAMA | (Panama City) | | President Juan Carlos Varela | | |
| | PERU | (Lima a + Arequipa d + Cusco h) | | President Martin Vizcarra | | |
| | PARAGUAY | (Assumption) | | President Horacio Cartes | | |
| | EL SALVADOR | (San Salvador) | | President Salvador Sanchez Ceren | | |
| | TRINIDAD AND TOBAGO | (Port-of-Spain) | | President Paula-Mae Weeke | | |
| | AMERICA | (Washington-District of Columbia) | | President Donald Trump | | |
| | URUGUAY | (Montevideo) | | President Tabare Vazquez | | |