Postal Code 18521 Boundary Map
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| Postal Code | 18521 |
| Postal Code Name | Wadi ad-Dawasir |
| Province | Riyadh Province |
| Governorate | Wadi Ad Dawasir Governorate |
| Timezone | Saudi Arabia Standard Time (+03) |
| Adjacent Postal Codes | 18411 18412 18413 18511 18515 18522 |