Willemstraat is een straat te Arnhem in de gemeente Arnhem en is gelegen in de Nederlandse provincie Gelderland.
| Postcode | Huisnummers |
|---|---|
| 6822 CT | 2C, 2 1, 2 2, 4, 6, 8, 10, 10, 12, 14, 16, 18, 20, 22, 24, 51, 53, 55, 57, 59; |
| 6822 CS | 1A, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49; |