C
| Town name | Postal code |
| Cala | 5455 |
| Caledon | 7185 |
| Caledon | 7230 |
| Caledon | 7232 |
| Caledon | 7250 |
| Calitzdorp | 6660 |
| Calvinia | 8190 |
| Calvinia | 8191 |
| Calvinia | 8193 |
| Cambridge | 5247 |
| Cape Town | 7400 |
| Cape Town | 7404 |
| Cape Town | 7405 |
| Cape Town | 7406 |
| Cape Town | 7407 |
| Cape Town | 7420 |
| Cape Town | 7425 |
| Cape Town | 7430 |
| Cape Town | 7435 |
| Cape Town | 7437 |
| Cape Town | 7439 |
| Cape Town | 7441 |
| Cape Town | 7455 |
| Cape Town | 7456 |
| Cape Town | 7460 |
| Cape Town | 7463 |
| Cape Town | 7489 |
| Cape Town | 7490 |
| Cape Town | 7493 |
| Cape Town | 7499 |
| Cape Town | 7500 |
| Cape Town | 7507 |
| Cape Town | 7525 |
| Cape Town | 7530 |
| Cape Town | 7535 |
| Cape Town | 7550 |
| Cape Town | 7551 |
| Cape Town | 7560 |
| Cape Town | 7561 |
| Cape Town | 7700 |
| Cape Town | 7705 |
| Cape Town | 7745 |
| Cape Town | 7750 |
| Cape Town | 7751 |
| Cape Town | 7755 |
| Cape Town | 7760 |
| Cape Town | 7100 |
| Cape Town | 7103 |
| Cape Town | 8160 |
| Cape Town | 7708 |
| Cape Town | 7725 |
| Cape Town | 7735 |
| Cape Town | 7764 |
| Cape Town | 7766 |
| Cape Town | 7779 |
| Cape Town | 7780 |
| Cape Town | 7782 |
| Cape Town | 7783 |
| Cape Town | 7784 |
| Cape Town | 7785 |
| Cape Town | 7789 |
| Cape Town | 7800 |
| Cape Town | 7801 |
| Cape Town | 7806 |
| Cape Town | 7808 |
| Cape Town | 7824 |
| Cape Town | 7848 |
| Cape Town | 7864 |
| Cape Town | 7872 |
| Cape Town | 7880 |
| Cape Town | 7888 |
| Cape Town | 7915 |
| Cape Town | 7925 |
| Cape Town | 7935 |
| Cape Town | 7937 |
| Cape Town | 7941 |
| Cape Town | 7945 |
| Cape Town | 7950 |
| Cape Town | 7965 |
| Cape Town | 7966 |
| Cape Town | 7974 |
| Cape Town | 7975 |
| Cape Town | 8000 |
| Cape Town | 8001 |
| Cape Town | 8002 |
| Cape Town | 8003 |
| Cape Town | 8005 |
| Cape Town | 8007 |
| Cape Town | 8008 |
| Cape Town | 8010 |
| Cape Town | 8012 |
| Cape Town | 8017 |
| Cape Town | 8018 |
| Cape Town | 8020 |
| Cape Town | 8040 |
| Cape Town | 8050 |
| Cape Town | 8051 |
| Cape Town | 8060 |
| Carletonville | 2495 |
| Carletonville | 2496 |
| Carletonville | 2499 |
| Carletonville | 2500 |
| Carletonville | 2501 |
| Carletonville | 2502 |
| Carletonville | 2503 |
| Carletonville | 2504 |
| Carletonville | 2507 |
| Carletonville | 2508 |
| Carletonville | 2509 |
| Carletonville | 2511 |
| Carletonville | 2513 |
| Carletonville | 2516 |
| Carletonville | 2517 |
| Carletonville | 2519 |
| Carltonville | 2534 |
| Carnarvon | 8922 |
| Carnarvon | 8925 |
| Carolina | 1185 |
| Cathcart | 5310 |
| Cato Ridge | 3680 |
| Centurion | 0014 |
| Centurion | 0046 |
| Centurion | 0051 |
| Centurion | 0149 |
| Centurion | 0157 |
| Centurion | 0163 |
| Centurion | 0171 |
| Centurion | 0172 |
| Ceres | 6835 |
| Ceres | 6836 |
| Ceres | 6837 |
| Ceres | 6838 |
| Ceres | 6840 |
| Ceza | 3871 |
| Chatsworth | 4030 |
| Chatsworth | 4054 |
| Chatsworth | 4084 |
| Chatsworth | 4087 |
| Chatsworth | 4092 |
| Chatsworth | 4132 |
| Chatsworth | 4142 |
| Chatsworth | 4147 |
| Chatsworth | 3604 |
| Chatsworth | 3610 |
| Christiana | 2680 |
| Chromite | 0362 |
| Chuenespoort | 0745 |
| Citrusdal | 7340 |
| Clanwilliam | 8120 |
| Clanwilliam | 8138 |
| Claremont | 7740 |
| Claremont | 7708 |
| Clarens | 9707 |
| Clarkebury | 5024 |
| Clarkebury | 5026 |
| Clernaville | 3610 |
| Clocolan | 9735 |
| Coalville | 1033 |
| Cofimvaba | 5329 |
| Cofimvaba | 5331 |
| Cofimvaba | 5375 |
| Cofimvaba | 5376 |
| Cofimvaba | 5377 |
| Cofimvaba | 5380 |
| Cofimvaba | 5381 |
| Cofimvaba | 5382 |
| Colchester | 6175 |
| Colenso | 3360 |
| Colesberg | 9795 |
| Colesberg | 9797 |
| Colesberg | 9922 |
| Coligny | 2725 |
| Coligny | 2726 |
| Coligny | 2727 |
| Constantia | 7806 |
| Cookhouse | 5820 |
| Cookhouse | 5821 |
| Cookhouse | 5824 |
| Cookhouse | 5830 |
| Cornelia | 9850 |
| Cradock | 5870 |
| Cradock | 5880 |
| Cradock | 5881 |
| Cradock | 5882 |
| Cradock | 5883 |
| Cradock | 5884 |
| Cradock | 5365 |
| Crawford | 7764 |
| Creighton | 3263 |
| Cullinan | 1002 |
| Cullinan | 1003 |
| Cullinan | 1004 |
| Cullinan | 1005 |
