Postal Code 18891 Boundary Map
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| Postal Code | 18891 |
| Postal Code Name | Al - Quwayiyah |
| Province | Riyadh Province |
| Governorate | Ar Rayn Governorate |
| Timezone | Saudi Arabia Standard Time (+03) |
| Adjacent Postal Codes | 18890 18893 18896 19529 19548 19549 |