| Place | Post Code |
|---|---|
| Chehe, Iriaini | 10100 |
| Gatundu, Iriaini | 10100 |
| Kaguyu, Iriaini | 10100 |
| Karia, Iriaini | 10100 |
| Kiaguthu, Iriaini | 10100 |
| Kiamwangi, Iriaini | 10100 |
| Thegenge, Iriaini | 10100 |
| All postal codes in Mathira | |
|---|---|
| Iriaini, Mathira | |
| Karatina Town, Mathira | |
| Kirimukuyu, Mathira | |
| Konyu, Mathira | |
| Magutu, Mathira | |
| Ruguru, Mathira | |