Willem Sijpesteijnstraat is een straat te Assendelft in de gemeente Zaanstad en is gelegen in de Nederlandse provincie Noord-Holland.
| Postcode | Huisnummers |
|---|---|
| 1566 KH | 2b, 2c, 2d, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24; |
| 1566 KG | 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95; |
| 1566 KJ | 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58; |
| 1566 KE | 1A, 1B, 1C, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47; |