| Place | Post Code |
|---|---|
| Gitundu, Iria-Ini | 10100 |
| Ihuririo, Iria-Ini | 10100 |
| Kairuthi, Iria-Ini | 10100 |
| Kiagonye, Iria-Ini | 10100 |
| Kiahugu, Iria-Ini | 10100 |
| Kiandemi, Iria-Ini | 10100 |
| Thunguri, Iria-Ini | 10100 |
| All postal codes in Othaya | |
|---|---|
| Chinga, Othaya | |
| Iria-Ini, Othaya | |
| Karima, Othaya | |
| Mahiga, Othaya | |