| Place | Post Code |
|---|---|
| Isaa, Mutha | 90200 |
| Kaatene, Mutha | 90200 |
| Kalambani, Mutha | 90200 |
| Kalia Katune, Mutha | 90200 |
| Kengo, Mutha | 90200 |
| Kiati, Mutha | 90200 |
| Kiimani, Mutha | 90200 |
| Kivyuni, Mutha | 90200 |
| Mutha, Mutha | 90211 |
| Ndakani, Mutha | 90200 |
| Ngaani, Mutha | 90200 |
| All postal codes in Kitui South | |
|---|---|
| Athi, Kitui South | |
| Ikanga/Kyatune, Kitui South | |
| Ikutha, Kitui South | |
| Kanziko, Kitui South | |
| Mutha, Kitui South | |
| Mutomo, Kitui South | |