Westdijk is een straat te Middelharnis in de gemeente Goeree-Overflakkee en is gelegen in de Nederlandse provincie Zuid-Holland.
| Postcode | Huisnummers |
|---|---|
| 3241 GT | 3, 5, 7, 11, 15, 15, 19, 21, 23, 23, 25, 25, 29, 31, 33, 35, 35, 41, 41, 43, 43, 43, 45, 45, 45, 49, 49, 53, 55, 55; |
| 3241 GV | 2a, 2, 4a, 8, 12, 12, 14, 18a, 18, 20a, 20, 22, 22, 22, 26, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 54, 56, 58, 60, 62, 64; |