As a box code, 4148 is used for 5 post office box locations.
PO Boxes using 4148
| Suburb | Town | Province |
|---|---|---|
| Reservoir Hills New | Durban | KwaZulu-Natal |
| Angola | Umlazi | KwaZulu-Natal |
| Umlazi GX5 | Umlazi | KwaZulu-Natal |
| Umlazi H1 | Umlazi | KwaZulu-Natal |
| Umlazi HX1 | Umlazi | KwaZulu-Natal |