Wilhelminalaan is een straat te Posterholt in de gemeente Roerdalen en is gelegen in de Nederlandse provincie Limburg.
| Postcode | Huisnummers |
|---|---|
| 6061 AZ | 48, 46, 44, 42, 40, 38, 36, 34, 32, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 2 TRAF; |
| 6061 AX | 45, 47, 49, 51, 1, 3, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43; |