Grietenij 12 is een straat te Lelystad in de gemeente Lelystad en is gelegen in de Nederlandse provincie Flevoland.
| Postcode | Huisnummers |
|---|---|
| 8233 BH | 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 24, 23, 22, 21, 20, 19; |
| 8233 BG | 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1; |