W
| Town name | Postal code |
| Wakkerstroom | 2480 |
| Walkerville | 1876 |
| Walmer | 6070 |
| Wapadrand | 0050 |
| Wapadrand | 0081 |
| Warden | 9890 |
| Warmbad | 0480 |
| Warmbad | 0482 |
| Warmbaths | 0483 |
| Warmbaths | 0492 |
| Warmbaths | 0406 |
| Warmbaths | 0420 |
| Warmbaths | 0430 |
| Warmbaths | 0480 |
| Warrenton | 8530 |
| Warrenton | 8532 |
| Wartburg | 3233 |
| Wartburg | 3234 |
| Wasbank | 2920 |
| Waterkloof | 0145 |
| Waterkloof | 0181 |
| Welkom | 9438 |
| Welkom | 9459 |
| Welkom | 9460 |
| Welkom | 9462 |
| Welkom | 9463 |
| Welkom | 9465 |
| Welkom | 9466 |
| Welkom | 9467 |
| Welkom | 9468 |
| Welkom | 9469 |
| Welkom | 9470 |
| Welkom | 9471 |
| Welkom | 9473 |
| Welkom | 9477 |
| Welkom | 9488 |
| Wellington | 7655 |
| Wellington | 7656 |
| Wepener | 9944 |
| Wesselsbron | 9680 |
| Wesselsbron | 9682 |
| Western Cape | 6655 |
| Western Cape | 6665 |
| Western Cape | 6820 |
| Westonaria | 1772 |
| Westonaria | 1779 |
| Westonaria | 1780 |
| Westonaria | 1781 |
| Westonaria | 1782 |
| Westonaria | 1784 |
| Westonaria | 1785 |
| Westonaria | 1786 |
| Westonaria | 1787 |
| Westonaria | 1788 |
| Westonaria | 1789 |
| Westville | 3629 |
| Westville | 3631 |
| Westville | 3634 |
| Westville | 3635 |
| White River | 1256 |
| White River | 1240 |
| White River | 1245 |
| Whiteriver | 1254 |
| Whittlesea | 5360 |
| Whittlesea | 5362 |
| Whittlesea | 5364 |
| Whittlesea | 5630 |
| Wierdapark | 0157 |
| Wierdapark | 0173 |
| Wierdapark | 0149 |
| Wierdapark | 0109 |
| Willowmore | 6446 |
| Willowmore | 6447 |
| Willowmore | 6451 |
| Willowmore | 6452 |
| Willowmore | 6454 |
| Willowvale | 5040 |
| Willowvale | 5041 |
| Willowvale | 5042 |
| Willowvale | 5043 |
| Winburg | 9420 |
| Winburg | 9421 |
| Windsorton | 8510 |
| Wingate Park | 0153 |
| Wingate Park | 0181 |
| Winklespruit | 4126 |
| Winklespruit | 4145 |
| Winterton | 3331 |
| Winterton | 3340 |
| Winterton | 3341 |
| Winterton | 3342 |
| Witbank | 2200 |
| Witbank | 2210 |
| Witbank | 2225 |
| Witbank | 2226 |
| Witbank | 2230 |
| Witbank | 2250 |
| Witbank | 1032 |
| Witbank | 1033 |
| Witbank | 1034 |
| Witbank | 1035 |
| Witbank | 1036 |
| Witbank | 1037 |
| Witbank | 1038 |
| Witbank | 1039 |
| Witbank | 1040 |
| Witbank | 1042 |
| Witbank | 1043 |
| Witbank | 1044 |
| Witbank | 1045 |
| Witbank | 1046 |
| Witbank | 1047 |
| Witbank | 1048 |
| Witbank | 1049 |
| Witbank | 1059 |
| Witbank | 1072 |
| Witbank | 1073 |
| Witbank | 1074 |
| Witbank | 1075 |
| Witbank | 1076 |
| Witbank | 1077 |
| Witbank | 1080 |
| Witbank | 1081 |
| Witbank | 1082 |
| Witbank | 1090 |
| Witbank | 1097 |
| Witbank | 1112 |
| Witkoppen | 2068 |
| Witkoppen | 2191 |
| Witrivier | 1240 |
| Witsieshoek | 9868 |
| Witsieshoek | 9869 |
| Witsieshoek | 9870 |
| Witsieshoek | 9875 |
| Witsieshoek | 9877 |
| Witsieshoek | 9878 |
| Wolmaransstad | 2630 |
| Wolseley | 6830 |
| Woodstock | 7925 |
| Worcester | 6845 |
| Worcester | 6850 |
| Worcester | 6851 |
| Worcester | 6852 |
| Worcester | 6853 |
| Worcester | 6854 |
| Worcester | 6855 |
| Worcester | 6856 |
| Worcester | 6857 |
| Worcester | 6858 |
| Worcester | 6859 |
| Worcester | 6861 |
| Worcester | 6862 |
| Worcester | 6863 |
| Worcester | 6870 |
| Wynberg | 7800 |
