South Korea Postal Code 31203 Boundary Map
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| Postal Code | 31203 |
| Postal Code Name | Cheonan-si |
| Province | Chungcheongnam-do |
| County | Cheonan-si |
| Timezone | Korean Standard Time (KST) |
| Adjacent Postal Codes | 31177 31178 31185 31201 31202 31204 31206 31209 |