| Place | Post Code |
|---|---|
| Donyo Loip, Sosian | 20300 |
| Kirimon, Sosian | 20300 |
| Loniek, Sosian | 20300 |
| Maundu Ni Meri, Sosian | 20300 |
| Sosian, Sosian | 20300 |
| All postal codes in Laikipia North | |
|---|---|
| Mukogondo East, Laikipia North | |
| Mukogondo West, Laikipia North | |
| Segera, Laikipia North | |
| Sosian, Laikipia North | |
| Umande, Laikipia North | |