Markham is a province in Papua New Guinea.
Papua New Guinea does not use the postal code or ZIP code system.
Papua New Guinea does not use the postal code or ZIP code system.
| Postal Code | Locality | Suburb | Latitude | Longitude |
|---|---|---|---|---|
| Onga-Waffa | -6.418185 | 146.725312 | ||
| Umi-Atzero | -6.418185 | 146.725312 | ||
| Wantoat-Leron | -6.418185 | 146.725312 |