G
| Town name | Postal code |
| Gakgapane | 0838 |
| Gakgapane | 0862 |
| Gakgapane | 0897 |
| Gakgapane | 0847 |
| Galeshewe | 8330 |
| Ga-Maraba | 0705 |
| Gambleville | 6241 |
| Gans Bay | 7220 |
| Gans Bay | 7221 |
| Gans Bay | 7271 |
| Ganyesa | 8582 |
| Ganyesa | 8587 |
| Ganyesa | 8604 |
| Ganyesa | 8623 |
| Ga-Rankuwa | 0208 |
| Garapulana | 9775 |
| Ga-Rapulana | 9775 |
| Ga-Rapulana | 9780 |
| Ga-Rapulana | 9783 |
| Garies | 8221 |
| Garies | 8223 |
| Garsfontein | 0042 |
| Garsfontein | 0081 |
| Gasehunelo | 9323 |
| Ga-Sehunelo | 9323 |
| Gatesville | 7762 |
| Gatesville | 7763 |
| Gatesville | 7764 |
| Gatesville | 7767 |
| Gatesville | 7769 |
| Gatesville | 7780 |
| Gauteng | 1438 |
| Gauteng | 1441 |
| Gauteng | 1609 |
| Gauteng | 1610 |
| Gauteng | 1820 |
| Gauteng | 1827 |
| Geduldpan | 9468 |
| Gelvandale | 6020 |
| George | 6529 |
| George | 6531 |
| George | 6534 |
| George | 6535 |
| George | 6536 |
| George | 6537 |
| George | 6538 |
| George | 6539 |
| George | 6541 |
| George | 6544 |
| George | 6560 |
| George | 6615 |
| George East | 6529 |
| Germiston | 1497 |
| Germiston | 1401 |
| Germiston | 1402 |
| Germiston | 1403 |
| Germiston | 1404 |
| Germiston | 1405 |
| Germiston | 1407 |
| Germiston | 1408 |
| Germiston | 1410 |
| Germiston | 1411 |
| Germiston | 1412 |
| Germiston | 1413 |
| Germiston | 1414 |
| Germiston | 1415 |
| Germiston | 1416 |
| Germiston | 1417 |
| Germiston | 1418 |
| Germiston | 1419 |
| Germiston | 1420 |
| Germiston | 1422 |
| Germiston | 1423 |
| Germiston | 1424 |
| Germiston | 1428 |
| Germiston | 1429 |
| Germiston | 1430 |
| Germiston | 1434 |
| Gillitts | 3610 |
| Gingindlovu | 3800 |
| Gingindlovu | 3803 |
| Gingindlovu | 3804 |
| Gingindlovu | 3806 |
| Gingindlovu | 3818 |
| Giyani | 0858 |
| Giyani | 0826 |
| Giyani | 0827 |
| Giyani | 0829 |
| Giyani | 0832 |
| Giyani | 0834 |
| Giyani | 0839 |
| Giyani | 0840 |
| Giyani | 0841 |
| Giyani | 0842 |
| Giyani | 0843 |
| Giyani | 0844 |
| Giyani | 0846 |
| Giyani | 0915 |
| Giyani | 0930 |
| Giyani | 0931 |
| Giyani | 0932 |
| Giyani | 0933 |
| Giyani | 0941 |
| Giyani | 0944 |
| Giyani | 0983 |
| Giyani | 0984 |
| Giyani | 0985 |
| Giyani | 0986 |
| Giyani | 0987 |
| Glencoe | 2930 |
| Glenstantia | 0181 |
| Glenstantia | 0010 |
| Gonubie | 5257 |
| Gonubie | 5258 |
| Goodwood | 7460 |
| Goodwood | 7463 |
| Goodwood | 7475 |
| Goodwood | 7485 |
| Gordon’S Bay | 7140 |
| Graaff-Reinet | 6280 |
| Graaff-Reinet | 6281 |
| Graaff-Reinet | 6286 |
| Graafwater | 8121 |
| Graafwater | 8122 |
| Grabouw | 7160 |
| Grabouw | 7171 |
| Grabouw | 7180 |
| Grahamstad | 5805 |
| Grahamstad | 6141 |
| Grahamstad | 6139 |
| Grahamstown | 6140 |
| Grahamstown | 6141 |
| Grahamstown | 6142 |
| Grahamstown | 6143 |
| Grahamstown | 6145 |
| Grahamstown | 6146 |
| Grahamstown | 6150 |
| Grahamstown | 5805 |
| Grahamstown | 6139 |
| Graskop | 1270 |
| Graskop | 1271 |
| Graskop | 1273 |
| Graskop | 1274 |
| Grassy Park | 7805 |
| Grassy Park | 7941 |
| Great Brak River | 6525 |
| Great Brak River | 6526 |
| Greytown | 3233 |
| Greytown | 3236 |
| Greytown | 3249 |
| Greytown | 3250 |
| Greytown | 3251 |
| Greytown | 3258 |
| Greytown | 3262 |
| Greytown | 3268 |
| Greytown | 3500 |
| Griquatown | 8365 |
| Groblersdal | 1030 |
| Groblersdal | 1060 |
| Groblersdal | 1061 |
| Groblersdal | 1064 |
| Groblersdal | 0470 |
| Groblersdal | 0473 |
| Groblersdal | 0474 |
| Groblersdal | 0477 |
| Groblersdal | 0485 |
| Groblersdal | 0490 |
| Groblersdal | 0491 |
| Groblershoop | 8826 |
| Groblershoop | 8851 |
| Groblershoop | 8943 |
| Groot-Brakrivier | 6525 |
| Grootdrink | 8822 |
| Gugulethu | 7750 |
| Guguletu | 7752 |
| Guguletu | 7756 |
| Guguletu | 7750 |
