As a box code, 4089 is used for 33 post office box locations.
PO Boxes using 4089
| Suburb | Town | Province |
|---|---|---|
| Vietnam | Ntokozweni | KwaZulu-Natal |
| Danisa Village | Umlazi | KwaZulu-Natal |
| Ireland | Umlazi | KwaZulu-Natal |
| Khayelisha | Umlazi | KwaZulu-Natal |
| Moscow | Umlazi | KwaZulu-Natal |
| Ntokozweni | Umlazi | KwaZulu-Natal |
| Ntokozweni F6 | Umlazi | KwaZulu-Natal |
| Ntokozweni H2 | Umlazi | KwaZulu-Natal |
| Ntokozweni Section D | Umlazi | KwaZulu-Natal |
| Ntokozweni Section Q | Umlazi | KwaZulu-Natal |
| Ntokozweni Section T | Umlazi | KwaZulu-Natal |
| Phola Place | Umlazi | KwaZulu-Natal |
| Shayamoya | Umlazi | KwaZulu-Natal |
| Tehuis 1 - 3 | Umlazi | KwaZulu-Natal |
| Thandanani | Umlazi | KwaZulu-Natal |
| Umlazi A1 | Umlazi | KwaZulu-Natal |
| Umlazi A2 | Umlazi | KwaZulu-Natal |
| Umlazi Aa | Umlazi | KwaZulu-Natal |
| Umlazi C | Umlazi | KwaZulu-Natal |
| Umlazi C1 | Umlazi | KwaZulu-Natal |
| Umlazi C2 | Umlazi | KwaZulu-Natal |
| Umlazi E4 | Umlazi | KwaZulu-Natal |
| Umlazi E7 | Umlazi | KwaZulu-Natal |
| Umlazi E9 | Umlazi | KwaZulu-Natal |
| Umlazi F1 | Umlazi | KwaZulu-Natal |
| Umlazi F2 | Umlazi | KwaZulu-Natal |
| Umlazi Glebe | Umlazi | KwaZulu-Natal |
| Umlazi Q | Umlazi | KwaZulu-Natal |
| Umlazi S1 | Umlazi | KwaZulu-Natal |
| Umlazi T | Umlazi | KwaZulu-Natal |
| Umlazi V4 | Umlazi | KwaZulu-Natal |
| Umlazi V6 | Umlazi | KwaZulu-Natal |
| Zimeleni | Umlazi | KwaZulu-Natal |