25997 is the Postal Code/PLZ Code for Hörnum (Sylt) in the Germany State of Schleswig-Holstein and the District of Landkreis Nordfriesland.
| Postal Code | 25997 |
| Postal Code Name | Hörnum (Sylt) |
| State | Schleswig-Holstein |
| District | Landkreis Nordfriesland |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 25980 |