As a box code, 4278 is used for 7 post office box locations.
PO Boxes using 4278
| Suburb | Town | Province |
|---|---|---|
| Munster | Margate | KwaZulu-Natal |
| Voortrekkerstrand | Margate | KwaZulu-Natal |
| Gate Store | Munster | KwaZulu-Natal |
| Glenmore Beach | Munster | KwaZulu-Natal |
| Kwanzimakwe | Munster | KwaZulu-Natal |
| Leisure Bay | Munster | KwaZulu-Natal |
| Town Board | Munster | KwaZulu-Natal |