As a box code, 4031 is used for 26 post office box locations.
Suburbs using 4031 as street code
| Suburb | Town | Province |
|---|---|---|
| Umlazi Phase 8 | Umlazi | KwaZulu-Natal |
PO Boxes using 4031
| Suburb | Town | Province |
|---|---|---|
| Engonyameni | Umlazi | KwaZulu-Natal |
| Gezangave | Umlazi | KwaZulu-Natal |
| Gomomo | Umlazi | KwaZulu-Natal |
| Kwankonka | Umlazi | KwaZulu-Natal |
| Lusaka | Umlazi | KwaZulu-Natal |
| Mseni | Umlazi | KwaZulu-Natal |
| Umlazi | Umlazi | KwaZulu-Natal |
| Umlazi 5 Ext 2 | Umlazi | KwaZulu-Natal |
| Umlazi C3 | Umlazi | KwaZulu-Natal |
| Umlazi Cc | Umlazi | KwaZulu-Natal |
| Umlazi D3 | Umlazi | KwaZulu-Natal |
| Umlazi F11 | Umlazi | KwaZulu-Natal |
| Umlazi F3 | Umlazi | KwaZulu-Natal |
| Umlazi F6 | Umlazi | KwaZulu-Natal |
| Umlazi F9 | Umlazi | KwaZulu-Natal |
| Umlazi FX6 | Umlazi | KwaZulu-Natal |
| Umlazi GX4 | Umlazi | KwaZulu-Natal |
| Umlazi GX8-9 | Umlazi | KwaZulu-Natal |
| Umlazi HX14 | Umlazi | KwaZulu-Natal |
| Umlazi HX17 | Umlazi | KwaZulu-Natal |
| Umlazi HX4 | Umlazi | KwaZulu-Natal |
| Umlazi N | Umlazi | KwaZulu-Natal |
| Umlazi New Village | Umlazi | KwaZulu-Natal |
| Umlazi Section F | Umlazi | KwaZulu-Natal |
| Umlazi Section V | Umlazi | KwaZulu-Natal |
| Umlazi White City | Umlazi | KwaZulu-Natal |