As a box code, 4400 is used for 13 post office box locations.
PO Boxes using 4400
| Suburb | Town | Province |
|---|---|---|
| Tongaat | Durban | KwaZulu-Natal |
| Bellgate | Tongaat | KwaZulu-Natal |
| Brake Village | Tongaat | KwaZulu-Natal |
| Brake Village Park | Tongaat | KwaZulu-Natal |
| Fairbreeze | Tongaat | KwaZulu-Natal |
| Gandhi's Hill | Tongaat | KwaZulu-Natal |
| Hambanati | Tongaat | KwaZulu-Natal |
| Hambanati Heights | Tongaat | KwaZulu-Natal |
| Hillview | Tongaat | KwaZulu-Natal |
| Newtown | Tongaat | KwaZulu-Natal |
| Nsuze | Tongaat | KwaZulu-Natal |
| Village Mews | Tongaat | KwaZulu-Natal |
| Village Park | Tongaat | KwaZulu-Natal |