| Subdivision category | 3166-2 code | Subdivision name |
|---|---|---|
| province | EC-A | Azuay |
| province | EC-B | Bolívar |
| province | EC-C | Carchi |
| province | EC-F | Cañar |
| province | EC-H | Chimborazo |
| province | EC-X | Cotopaxi |
| province | EC-O | El Oro |
| province | EC-E | Esmeraldas |
| province | EC-W | Galápagos |
| province | EC-G | Guayas |
| province | EC-I | Imbabura |
| province | EC-L | Loja |
| province | EC-R | Los Ríos |
| province | EC-M | Manabí |
| province | EC-S | Morona Santiago |
| province | EC-N | Napo |
| province | EC-D | Orellana |
| province | EC-Y | Pastaza |
| province | EC-P | Pichincha |
| province | EC-SE | Santa Elena |
| province | EC-SD | Santo Domingo de los Tsáchilas |
| province | EC-U | Sucumbíos |
| province | EC-T | Tungurahua |
| province | EC-Z | Zamora Chinchipe |