A
| Town name | Postal code |
| Aberdeen | 6270 |
| Acornhoek | 1227 |
| Acornhoek | 1360 |
| Acornhoek | 1361 |
| Acornhoek | 1365 |
| Acornhoek | 1367 |
| Acornhoek | 1370 |
| Acornhoek | 1378 |
| Addo | 6105 |
| Addo | 6107 |
| Addo | 6109 |
| Addo | 6115 |
| Adelaide | 5760 |
| Adendorp | 6282 |
| Albertina | 6695 |
| Albertina | 6696 |
| Albertinia | 6695 |
| Alberton | 1452 |
| Alberton | 1453 |
| Alberton | 1454 |
| Alberton | 1455 |
| Alberton | 1456 |
| Alberton | 1457 |
| Alberton | 1458 |
| Alberton | 1481 |
| Alberton | 1447 |
| Alberton | 1448 |
| Alberton | 1449 |
| Alberton | 1451 |
| Alexander Bay | 8290 |
| Alexander Bay | 8292 |
| Alexander Bay | 8294 |
| Alexandria | 6185 |
| Alexandria | 6186 |
| Alexandria | 6187 |
| Alexandria | 6189 |
| Alice | 5700 |
| Alice | 5701 |
| Alice | 5702 |
| Alice | 5703 |
| Alice | 5705 |
| Alice | 5706 |
| Alice | 5708 |
| Alicedale | 6135 |
| Aliwal North | 9750 |
| Aliwal North | 9752 |
| Aliwal North | 9754 |
| Aliwal-Noord | 9750 |
| Allanridge | 9490 |
| Allanridge | 9492 |
| Allen’S Nek | 1709 |
| Allen’S Nek | 1737 |
| Alrode | 1451 |
| Alrode | 1484 |
| Alrode | 1428 |
| Amanzimtoti | 3279 |
| Amanzimtoti | 4100 |
| Amanzimtoti | 4120 |
| Amanzimtoti | 4125 |
| Amanzimtoti | 4126 |
| Amanzimtoti | 4135 |
| Amanzimtoti | 4136 |
| Amanzimtoti | 4140 |
| Amanzimtoti | 4145 |
| Amanzimtoti | 4150 |
| Amanzimtoti | 4155 |
| Amanzimtoti | 4160 |
| Amersfoort | 2490 |
| Amsterdam | 2375 |
| Anerley | 4230 |
| Arlington | 9602 |
| Ashton | 6715 |
| Athlone | 7764 |
| Atlantis | 7304 |
| Atlantis | 7348 |
| Atlantis | 7349 |
| Atlantis | 7350 |
| Atlantis | 7353 |
| Atlantis | 7354 |
| Atlantis | 7358 |
| Atok | 0749 |
| Atteridgeville | 0008 |
