| Locality | Post Code |
|---|---|
| Cestohowa, Karnes | 78113 |
| Coy City, Karnes | 78118 |
| Ecleto, Karnes | 78111 |
| Falls City, Karnes | 78113 |
| Gillett, Karnes | 78116 |
| Hobson, Karnes | 78117 |
| Karnes City, Karnes | 78118 |
| Kenedy, Karnes | 78119 |
| McCoy, Karnes | 78113 |
| Panna Maria, Karnes | 78144 |
| Pawelekville, Karnes | 78113 |
| Runge, Karnes | 78151 |