31840 is the Postal Code/PLZ Code for Hessisch Oldendorf in the Germany State of Lower Saxony and the District of Landkreis Hameln-Pyrmont. The town of Hessisch Oldendorf is located in Postal Code 31840.
| Postal Code | 31840 |
| Postal Code Name | Hessisch Oldendorf |
| State | Lower Saxony |
| District | Landkreis Hameln-Pyrmont |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 31737 31749 31787 31848 31855 31867 |