J6T 4T4 is Canadian Postal Code located in Salaberry-de-Valleyfield Quebec.
| Postal Code | J6T 4T4 |
| Forward Sortation Area | J6T |
| Name | Salaberry-de-Valleyfield |
| Province | Quebec |
| Administrative Division | Beauharnois-Salaberry Regional County Municipality |
| Timezone | Eastern Daylight Time (EDT) |
| Area Code(s) | 450 / 579 |