't Westert is een straat te Oldemarkt in de gemeente Steenwijkerland en is gelegen in de Nederlandse provincie Overijssel.
| Postcode | Huisnummers |
|---|---|
| 8375 CH | 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25; |
| 8375 CJ | 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40t, 40; |