As a box code, 4321 is used for 1 post office box location.
PO Boxes using 4321
| Suburb | Town | Province |
|---|---|---|
| Gateway | Umhlanga Rocks | KwaZulu-Natal |
Postal code 4321
Umhlanga Rocks, KwaZulu-Natal
4321 is a PO Box code in KwaZulu-Natal, South Africa, mainly serving Umhlanga Rocks.