| Place | Postal Code |
|---|---|
| Kaborogin, Koyo-Ndurio | 30300 |
| Kabuson, Koyo-Ndurio | 30300 |
| Kapkolei, Koyo-Ndurio | 30300 |
| Kapsoas, Koyo-Ndurio | 30300 |
| Kapsoiyo, Koyo-Ndurio | 30300 |
| Keburo, Koyo-Ndurio | 30300 |
| Kimolwo, Koyo-Ndurio | 30300 |
| Koyo, Koyo-Ndurio | 30300 |
| Ndurio, Koyo-Ndurio | 30300 |
| Sarma, Koyo-Ndurio | 30300 |
| Teretmoi, Koyo-Ndurio | 30300 |
| Urugoi, Koyo-Ndurio | 30300 |
| Postal Codes in Aldai | |
|---|---|
| Kabwareng, Aldai | |
| Kaptumo-Kaboi, Aldai | |
| Kemeloi-Maraba, Aldai | |
| Kobujoi, Aldai | |
| Koyo-Ndurio, Aldai | |
| Terik, Aldai | |