66509 is the Postal Code/PLZ Code for Rieschweiler-Mühlbach in the Germany State of Rhineland-Palatinate and the District of Landkreis Südwestpfalz.
| Postal Code | 66509 |
| Postal Code Name | Rieschweiler-Mühlbach |
| State | Rhineland-Palatinate |
| District | Landkreis Südwestpfalz |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 66484 66497 66503 66506 66987 66989 |