| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Mount Hagen (rural), Mount Hagen | 281 |
| Postal/ZIP Codes in Mount Hagen (urban), Mount Hagen | 281 |
| Postal Codes in Western Highlands | |
|---|---|
| Postal/ZIP Codes in Tambul-Nebilyer | Postal/ZIP Codes in Mul-Baiyer |
| Postal/ZIP Codes in Mount Hagen | Postal/ZIP Codes in Dei |