Westerlaan is een straat te De Bilt in de gemeente De Bilt en is gelegen in de Nederlandse provincie Utrecht.
| Postcode | Huisnummers |
|---|---|
| 3731 EK | 1, 3, 5, 7A, 7, 9, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43; |
| 3731 EL | 2, 4A, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26A, 26, 28, 30, 32, 34, 36, 40, 42, 44, 46, 48; |