As a box code, 1040 is used for 6 post office box locations.
PO Boxes using 1040
| Suburb | Town | Province |
|---|---|---|
| Emalahleni Ext 11 | eMalahleni (Witbank) | Mpumalanga |
| Tasbet Park | eMalahleni (Witbank) | Mpumalanga |
| Tasbet Park Ext | eMalahleni (Witbank) | Mpumalanga |
| Tasbet Park Ext 1 | eMalahleni (Witbank) | Mpumalanga |
| Tasbet Park Ext 2 | eMalahleni (Witbank) | Mpumalanga |
| Tasbet Park Ext 3 | eMalahleni (Witbank) | Mpumalanga |