Oosterstraat is een straat te Haarlem in de gemeente Haarlem en is gelegen in de Nederlandse provincie Noord-Holland.
| Postcode | Huisnummers |
|---|---|
| 2022 CT | 1A, 1C, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35; |
| 2022 CV | 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65; |
| 2022 CW | 2A, 2B, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32; |
| 2022 CX | 34A, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60A, 60, 64A, 64B, 64; |