| Place | Post Code |
|---|---|
| Dienya West, West Gem | 40600 |
| Dienye East, West Gem | 40600 |
| Malunga East, West Gem | 40600 |
| Malunga West, West Gem | 40600 |
| Nguge, West Gem | 40600 |
| Ulamba, West Gem | 40600 |
| Uriri, West Gem | 40600 |
| Wagai, West Gem | 40600 |
| All postal codes in Gem | |
|---|---|
| Central Gem, Gem | |
| East Gem, Gem | |
| North Gem, Gem | |
| South Gem, Gem | |
| West Gem, Gem | |
| Yala Township, Gem | |