As a box code, 2161 is used for 18 post office box locations.
PO Boxes using 2161
| Suburb | Town | Province |
|---|---|---|
| Sundowner | Johannesburg | Gauteng |
| Sundowner Ext 10 | Johannesburg | Gauteng |
| Sundowner Ext 15 | Johannesburg | Gauteng |
| Sundowner Ext 18 | Johannesburg | Gauteng |
| Sundowner Ext 2 | Johannesburg | Gauteng |
| Sundowner Ext 21 | Johannesburg | Gauteng |
| Sundowner Ext 25 | Johannesburg | Gauteng |
| Sundowner Ext 26 | Johannesburg | Gauteng |
| Sundowner Ext 30 | Johannesburg | Gauteng |
| Sundowner Ext 31 | Johannesburg | Gauteng |
| Sundowner Ext 32 | Johannesburg | Gauteng |
| Sundowner Ext 33 | Johannesburg | Gauteng |
| Sundowner Ext 4 | Johannesburg | Gauteng |
| Sundowner Ext 41 | Johannesburg | Gauteng |
| Sundowner Ext 6 | Johannesburg | Gauteng |
| Sundowner Ext 60 | Johannesburg | Gauteng |
| Sundowner Ext 7 | Johannesburg | Gauteng |
| Sundowner Ext 8 | Johannesburg | Gauteng |