| Postal Code | 01-424 |
| Postal Code Name | Warsaw |
| Voivodeship | Masovian Voivodeship |
| County | Warsaw |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 01-126 01-127 01-128 01-141 01-142 01-147 01-154 01-159 01-161 01-163 01-164 01-167 01-223 01-240 01-242 01-401 01-405 01-410 01-411 01-416 01-418 01-419 01-420 01-423 01-429 01-438 01-494 01-749 01-797 |