Walstro is een straat te Castricum in de gemeente Castricum en is gelegen in de Nederlandse provincie Noord-Holland.
| Postcode | Huisnummers |
|---|---|
| 1902 JN | 3v, 3w, 3, 4a, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 3u, 3t, 3s, 3r, 3q, 3p, 3o, 3n, 3m, 3l, 3k, 3j, 3i, 3h, 3g, 3f, 3e, 3d, 3c, 3b, 3a, 2, 2a, 1; |
| 1902 JP | 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60; |