Postal Code 18657 Boundary Map
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| Postal Code | 18657 |
| Postal Code Name | Wadi ad-Dawasir |
| Province | Riyadh Province |
| Governorate | As Sulayyil Governorate |
| Timezone | Saudi Arabia Standard Time (+03) |
| Adjacent Postal Codes | 18652 18653 18654 18656 18658 18659 18667 18668 |