| Place | Post Code |
|---|---|
| Baricho, Karatina Town | 10100 |
| Cheru, Karatina Town | 10100 |
| Ichuga, Karatina Town | 10100 |
| Itiati, Karatina Town | 10100 |
| Ragati, Karatina Town | 10100 |
| All postal codes in Mathira | |
|---|---|
| Iriaini, Mathira | |
| Karatina Town, Mathira | |
| Kirimukuyu, Mathira | |
| Konyu, Mathira | |
| Magutu, Mathira | |
| Ruguru, Mathira | |