J4K 3X8 is Canadian Postal Code located in Longueuil Quebec.
| Postal Code | J4K 3X8 |
| Forward Sortation Area | J4K |
| Name | Longueuil |
| Province | Quebec |
| Administrative Division | Champlain Regional County Municipality |
| Timezone | Eastern Daylight Time (EDT) |
| Area Code(s) | 450 / 579 |