South Korea Postal Code 57778 Boundary Map
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| Postal Code | 57778 |
| Postal Code Name | Gwangyang-si |
| Province | Jeollanam-do |
| County | Gwangyang-si |
| Timezone | Korean Standard Time (KST) |
| Adjacent Postal Codes | 57773 57774 57777 57779 57780 57781 |