Gronddiep is een straat te Bellingwolde in de gemeente Bellingwedde en is gelegen in de Nederlandse provincie Groningen.
| Postcode | Huisnummers |
|---|---|
| 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; |
| 9695 BE | 50, 48, 44, 42, 40, 38, 36, 34, 32, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2; |