As a box code, 0156 is used for 9 post office box locations.
PO Boxes using 0156
| Suburb | Town | Province |
|---|---|---|
| Ninapark Ext 1 | Ninapark | Gauteng |
| Ninapark Ext 2 | Ninapark | Gauteng |
| Ninapark Ext 3 | Ninapark | Gauteng |
| Ninapark Ext 5 | Ninapark | Gauteng |
| Ninapark Ext 6 | Ninapark | Gauteng |
| Ninapark Ext 7 | Ninapark | Gauteng |
| Ninapark Ext 8 | Ninapark | Gauteng |
| Ninapark | Pretoria | Gauteng |
| Thornbrook Golf Estate | Pretoria | Gauteng |