As a box code, 1551 is used for 11 post office box locations.
PO Boxes using 1551
| Suburb | Town | Province |
|---|---|---|
| Chris Hani | Tsakane | Gauteng |
| Cuba | Tsakane | Gauteng |
| Langaville Ext 2 | Tsakane | Gauteng |
| Tsakane Ext | Tsakane | Gauteng |
| Tsakane Ext 12 | Tsakane | Gauteng |
| Tsakane Ext 12B | Tsakane | Gauteng |
| Tsakane Ext 19 | Tsakane | Gauteng |
| Tsakane Ext 4 | Tsakane | Gauteng |
| Tsakane Ext 5 | Tsakane | Gauteng |
| Tsakane Ext 8 | Tsakane | Gauteng |
| Xhosa Street | Tsakane | Gauteng |