De Oostermaat is een straat te Westerbork in de gemeente Midden-Drenthe en is gelegen in de Nederlandse provincie Drenthe.
| Postcode | Huisnummers |
|---|---|
| 9431 TW | 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 10, 8, 6, 4, 2; |
| 9431 TV | 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, 5, 3, 1; |