N4 — 11 codes dans 11 localités (Canada).
| Code postal | Localité / Quartier | Zone administrative | Coordonnées |
|---|---|---|---|
| Delhi | Ontario | 42.8501, -80.4997 | |
| Tillsonburg | Ontario | 42.8599, -80.7262 | |
| Owen Sound | Ontario | 44.5672, -80.9435 | |
| Meaford | Ontario | 44.6001, -80.583 | |
| Hanover | Ontario | 44.1501, -81.033 | |
| Woodstock Central | Woodstock · Ontario | 43.1432, -80.7338 | |
| Woodstock North | Woodstock · Ontario | 43.1485, -80.7319 | |
| Woodstock South | Woodstock · Ontario | 43.115, -80.743 | |
| Listowel | Ontario | 43.7334, -80.9497 | |
| St. Mary's | Ontario | 43.2655, -81.1687 | |
| Stratford South | Ontario | 43.3634, -81.0069 |