| Country | Poland (PL) |
| UN/LOCODE | SEJ |
| Name | Sejny |
| Name Without Diacritics | Sejny |
| Region | 20 |
| Function Code | --3----- |
| Function | Road |
| Status Code | RL (Recognised Location) |
| Date | 1601 |
| Timezone | Europe/Warsaw |
| Location (UN Format) | 5406N 02321E |
| Latitude Longitude | 54.108, 23.347 |