South Korea Postal Code 28108 Boundary Map
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| Postal Code | 28108 |
| Postal Code Name | Cheongju-si |
| Province | Chungcheongbuk-do |
| County | Cheongju-si |
| Timezone | Korean Standard Time (KST) |
| Adjacent Postal Codes | 27868 27870 28107 28109 28129 31261 |