Oosterstraat is een straat te Bunschoten-Spakenburg in de gemeente Bunschoten en is gelegen in de Nederlandse provincie Utrecht.
| Postcode | Huisnummers |
|---|---|
| 3751 EH | 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4; |
| 3751 EG | 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 9, 5; |