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| Name | Street Code | PO Box Code | City | Province |
| Oberholzer | 2499 | 2502 | Southwest Rand | Gauteng |
| Odendaalsrus | 9480 | 9480 | Southern Free State | Free State |
| Ogies | 2230 | 2230 | Emalahleni | Mpumalanga |
| Ohrigstad | 1122 | 1122 | Lowveld | Limpopo |
| Olievenhoutbosch | 0175 | 0187 | Tshwane South | Gauteng |
| Olifantsfontein | 1666 | 1665 | Northwest Rand | Gauteng |
| Olifantshoek | 8450 | 8450 | Kalahari | Northern Cape |
| Onderstepoort | 0110 | 0110 | Tshwane North | Gauteng |
| Onrusrivier | 7201 | 7201 | Overberg | Western Cape |
| Onverwacht | 0557 | 0557 | Waterberg | Limpopo |
| Or Tambo International Airport | 1627 | 1627 | East Rand | Gauteng |
| Orange Farm | 1841 | 1805 | East Vaal | Gauteng |
| Orange Grove | 2192 | 2119 | Northwest Rand | Gauteng |
| Oranjekruin | 8801 | 8807 | Kalahari | Northern Cape |
| Oranjeville | 1995 | 1995 | Central North | Free State |
| Orkney | 2619 | 2620 | Central North | North West |
| Orlando | 1804 | 1803 | Southwest Rand | Gauteng |
| Oshoek Border Post | 2356 | 2356 | Secunda | Mpumalanga |
| Osizweni | 2952 | 2952 | Northern Natal | Kwazulu-Natal |
| Ottery | 7800 | 7808 | Peninsula | Western Cape |
| Ottosdal | 2610 | 2610 | Central North | North West |
| Oudtshoorn | 6625 | 6620 | South Cape | Western Cape |
| Overport | 4001 | 4067 | Port Natal | Kwazulu-Natal |
| Ozwatini | 3242 | 3242 | Midlands | Kwazulu-Natal |
These post office details have been gathered from information supplied at www.postoffice.co.za. Blaauwberg Online™ accepts no responsibility for errors that may be as a result of the SA Post Office.
