| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Old Nabumai | city | New Ireland | Papua New Guinea | -3.70 | 152.43 | 259 | 2504 |
| Olmalag | city | New Ireland | Papua New Guinea | -2.78 | 150.97 | 36 | 870 |
| Omo | city | New Ireland | Papua New Guinea | -2.57 | 150.82 | 0 | 6851 |
| Opalla | city | New Ireland | Papua New Guinea | -2.71 | 150.58 | 0 | 278 |