Postal Code 18988 Boundary Map
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| Postal Code | 18988 |
| Postal Code Name | Al - Quwayiyah |
| Province | Riyadh Province |
| Governorate | Al Quwayiyah Governorate |
| Timezone | Saudi Arabia Standard Time (+03) |
| Adjacent Postal Codes | 18984 18985 18987 18989 18994 18998 |