Poland Postal Code 18-420 Boundary Map
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| Postal Code | 18-420 |
| Postal Code Name | Jedwabne |
| Voivodeship | Podlaskie Voivodeship |
| County | Łomża County |
| Timezone | Central European Time (CET) |
| Adjacent Postal Codes | 18-421 18-423 18-430 18-520 19-104 19-213 |