South Korea Postal Code 31204 Boundary Map
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| Postal Code | 31204 |
| Postal Code Name | Cheonan-si |
| Province | Chungcheongnam-do |
| County | Cheonan-si |
| Timezone | Korean Standard Time (KST) |
| Adjacent Postal Codes | 31202 31203 31205 31206 31207 31208 31209 |