De Oostermaat is een straat te Gramsbergen in de gemeente Hardenberg en is gelegen in de Nederlandse provincie Overijssel.
| Postcode | Huisnummers |
|---|---|
| 7783 BW | 47, 49, 51, 53, 55, 57, 59a, 59b, 59c, 59, 61, 63a, 63, 65, 67, 45, 43, 41, 39, 37, 35; |
| 7783 BX | 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 60a i, 60a, 60b, 60c, 60d, 60e, 60f, 60g, 60h, 60k, 60m, 60n, 60p, 60s, 60v, 60, 62a, 62b, 62c, 62d, 62e, 62f, 62g, 62h, 62, 64, 66a, 66; |
| 7783 BV | 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 13a, 11, 9, 7, 5, 3, 1; |