As a box code, 2155 is used for 18 post office box locations.
PO Boxes using 2155
| Suburb | Town | Province |
|---|---|---|
| Northwold | Johannesburg | Gauteng |
| Northwold Ext 1 | Johannesburg | Gauteng |
| Northwold Ext 11 | Johannesburg | Gauteng |
| Northwold Ext 12 | Johannesburg | Gauteng |
| Northwold Ext 13 | Johannesburg | Gauteng |
| Northwold Ext 15 | Johannesburg | Gauteng |
| Northwold Ext 17 | Johannesburg | Gauteng |
| Northwold Ext 2 | Johannesburg | Gauteng |
| Northwold Ext 20 | Johannesburg | Gauteng |
| Northwold Ext 23 | Johannesburg | Gauteng |
| Northwold Ext 24 | Johannesburg | Gauteng |
| Northwold Ext 4 | Johannesburg | Gauteng |
| Northwold Ext 40 | Johannesburg | Gauteng |
| Northwold Ext 44 | Johannesburg | Gauteng |
| Northwold Ext 5 | Johannesburg | Gauteng |
| Northwold Ext 6 | Johannesburg | Gauteng |
| Northwold Ext 8 | Johannesburg | Gauteng |
| Northwold Ext 21 | Northwold | Gauteng |