| Postal Code | 81-531 |
| Postal Code Name | Gdynia |
| Voivodeship | Pomeranian Voivodeship |
| County | Gdynia |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 81-504 81-528 81-533 81-534 81-535 81-549 81-552 81-553 81-554 81-555 81-557 81-571 81-573 81-575 81-577 81-578 81-580 81-581 81-583 81-584 81-586 81-587 81-593 81-596 |