Gronddiep is een straat te Bellingwolde in de gemeente Bellingwedde en is gelegen in de Nederlandse provincie Groningen.
| Postcode | Huisnummers |
|---|---|
| 9695 BE | 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 48, 50; |
| 9695 BX | 1a, 1, 3, 5, 7, 9, 11, 13, 15, 17, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61; |