As a box code, 5100 is used for 44 post office box locations.
Suburbs using 5100 as street code
PO Boxes using 5100
| Suburb | Town | Province |
|---|---|---|
| Bashee Bridge | Mthatha | Eastern Cape |
| Central | Mthatha | Eastern Cape |
| Emabheleni | Mthatha | Eastern Cape |
| Esdabrook | Mthatha | Eastern Cape |
| Griebdale | Mthatha | Eastern Cape |
| Gwendo | Mthatha | Eastern Cape |
| Kambi | Mthatha | Eastern Cape |
| Kwahermans | Mthatha | Eastern Cape |
| Lukwetu | Mthatha | Eastern Cape |
| Lupindo | Mthatha | Eastern Cape |
| Lurasheni | Mthatha | Eastern Cape |
| Luxolweni | Mthatha | Eastern Cape |
| Mackweza | Mthatha | Eastern Cape |
| Matonana | Mthatha | Eastern Cape |
| Mbolompo | Mthatha | Eastern Cape |
| Mbozisa | Mthatha | Eastern Cape |
| Mbuqe Ext | Mthatha | Eastern Cape |
| Mendu | Mthatha | Eastern Cape |
| Mgubo | Mthatha | Eastern Cape |
| Mjika | Mthatha | Eastern Cape |
| Mobantu | Mthatha | Eastern Cape |
| Monarch | Mthatha | Eastern Cape |
| Mparane | Mthatha | Eastern Cape |
| Mqwangqweni | Mthatha | Eastern Cape |
| Mtentu | Mthatha | Eastern Cape |
| New Nek | Mthatha | Eastern Cape |
| Ngangelizwe | Mthatha | Eastern Cape |
| Nomadolo | Mthatha | Eastern Cape |
| Ntsaka | Mthatha | Eastern Cape |
| Ntshilini | Mthatha | Eastern Cape |
| Payne TSP | Mthatha | Eastern Cape |
| Phiphany | Mthatha | Eastern Cape |
| Sibangweni | Mthatha | Eastern Cape |
| Sikobobo | Mthatha | Eastern Cape |
| Sixambuzi | Mthatha | Eastern Cape |
| Stonyridge | Mthatha | Eastern Cape |
| Thornhill | Mthatha | Eastern Cape |
| Tshani | Mthatha | Eastern Cape |
| Tunxe | Mthatha | Eastern Cape |
| Twecu | Mthatha | Eastern Cape |
| Umtata Mouth | Mthatha | Eastern Cape |
| Vernonspost | Mthatha | Eastern Cape |
| Zimbane TSP | Mthatha | Eastern Cape |
| Zizanela | Mthatha | Eastern Cape |