31868 is the Postal Code/PLZ Code for Ottenstein in the Germany State of Lower Saxony and the District of Landkreis Holzminden.
| Postal Code | 31868 |
| Postal Code Name | Ottenstein |
| State | Lower Saxony |
| District | Landkreis Holzminden |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 31812 31860 37619 37647 |