C1B 3A9 is Canadian Postal Code located in Johnstons River Prince Edward Island.
| Postal Code | C1B 3A9 |
| Forward Sortation Area | C1B |
| Name | Johnstons River |
| Province | Prince Edward Island |
| Administrative Division | Queens County |
| Timezone | (ADT) |
| Area Code(s) | 782 / 902 |