Poland Postal Code 06-521 Boundary Map
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| Postal Code | 06-521 |
| Postal Code Name | Wiśniewo |
| Voivodeship | Masovian Voivodeship |
| County | Mława County |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 06-445 06-500 06-516 06-522 06-545 06-550 06-561 |