| Postal Code | 01-531 |
| Postal Code Name | Warsaw |
| Voivodeship | Masovian Voivodeship |
| County | Warsaw |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 00-280 01-521 01-529 01-530 01-532 01-537 01-601 01-604 01-651 01-673 01-674 01-813 01-815 01-966 01-971 01-977 03-126 03-128 03-185 03-194 03-213 03-215 03-216 03-301 03-303 |