| Place | Post Code |
|---|---|
| Kalivu, Athi | 90200 |
| Katilini, Athi | 90200 |
| Kilawa, Athi | 90200 |
| Kisiio, Athi | 90200 |
| Kituti, Athi | 90200 |
| Makaie, Athi | 90200 |
| Maluma, Athi | 90200 |
| Monguni, Athi | 90200 |
| Muambani, Athi | 90200 |
| Tsavo East, Athi | 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 | |