I
| Town name | Postal code |
| Idutywa | 5000 |
| Idutywa | 5002 |
| Idutywa | 5003 |
| Idutywa | 5004 |
| Idutywa | 5005 |
| Idutywa | 5006 |
| Idutywa | 5007 |
| Idutywa | 5010 |
| Idutywa | 5011 |
| Idutywa | 5012 |
| Idutywa | 5014 |
| Idutywa | 5015 |
| Idutywa | 5016 |
| Idutywa | 5017 |
| Idutywa | 5018 |
| Idutywa | 5019 |
| Idutywa | 5021 |
| Ifafa Beach | 4185 |
| Illovo Beach | 4126 |
| Impendle | 3227 |
| Impendle | 3228 |
| Inanda | 4032 |
| Inanda | 4309 |
| Inanda | 4310 |
| Indwe | 5445 |
| Ingwavuma | 3964 |
| Ingwavuma | 3968 |
| Ingwavuma | 3977 |
| Isipingo | 4066 |
| Isipingo | 4110 |
| Isipingo | 4111 |
| Isipingo | 4113 |
| Isipingo | 4133 |
| Isipingo | 4153 |
| Isipingo Beach | 4133 |
| Isipingo Beach | 4115 |
| Itsoseng | 2717 |
| Itsoseng | 2744 |
| Ivory Park | 1689 |
| Ivory Park | 1693 |
| Izingolweni | 4260 |
| Izingolweni | 4261 |
