UpAlphabetical listing of Places in Western
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ob | city | Western | Papua New Guinea | -7.77 | 141.28 | 219 | 149 |
| Obami | city | Western | Papua New Guinea | -6.34 | 142.41 | 994 | 149 |
| Obeimi | city | Western | Papua New Guinea | -6.34 | 142.41 | 994 | 149 |
| Odogumbi | city | Western | Papua New Guinea | -6.45 | 142.25 | 830 | 149 |
| Oede | city | Western | Papua New Guinea | -8.31 | 142.88 | 3 | 98 |
| Ogun | city | Western | Papua New Guinea | -5.54 | 141.01 | 830 | 325 |
| Oikiwa | city | Western | Papua New Guinea | -7.90 | 142.83 | 830 | 149 |
| Okidetau | city | Western | Papua New Guinea | -5.32 | 141.23 | 1699 | 149 |
| Oktambip | city | Western | Papua New Guinea | -5.12 | 141.12 | 5935 | 149 |
| Oktidetau | city | Western | Papua New Guinea | -5.33 | 141.27 | 1863 | 149 |
| Old Bovakaka | city | Western | Papua New Guinea | -6.98 | 141.03 | 3 | 135 |
| Old Dimiri | city | Western | Papua New Guinea | -8.86 | 142.41 | 82 | 149 |
| Old Griengas | city | Western | Papua New Guinea | -5.91 | 141.35 | 377 | 149 |
| Old Kawok | city | Western | Papua New Guinea | -6.16 | 141.17 | 9 | 149 |
| Old Kukodobi | city | Western | Papua New Guinea | -6.37 | 142.17 | 830 | 149 |
| Old Pisa | city | Western | Papua New Guinea | -7.03 | 141.23 | 85 | 149 |
| Old Setavi | city | Western | Papua New Guinea | -8.52 | 141.60 | 127 | 1413 |
| Old Somaidemasuk | city | Western | Papua New Guinea | -5.92 | 141.33 | 406 | 149 |
| Olsobip | city | Western | Papua New Guinea | -5.39 | 141.52 | 1919 | 149 |
| Omowabi | city | Western | Papua New Guinea | -6.17 | 142.15 | 830 | 149 |
| Opka | city | Western | Papua New Guinea | -5.70 | 141.02 | 830 | 165 |
| Orapoi | city | Western | Papua New Guinea | -8.08 | 143.58 | 0 | 102 |
| Oriomo | city | Western | Papua New Guinea | -8.88 | 143.17 | 236 | 149 |
| Oromosapua | city | Western | Papua New Guinea | -8.65 | 143.62 | 3 | 62 |
| Oromosapuo | city | Western | Papua New Guinea | -8.65 | 143.62 | 3 | 62 |
| Oropai | city | Western | Papua New Guinea | -8.22 | 143.63 | 3 | 89 |
| Oropoi | city | Western | Papua New Guinea | -8.08 | 143.58 | 0 | 102 |
| Orumusapu | city | Western | Papua New Guinea | -8.65 | 143.62 | 3 | 62 |
| Osasu | city | Western | Papua New Guinea | -6.60 | 142.60 | 1000 | 180 |
| Ot | city | Western | Papua New Guinea | -5.95 | 141.05 | 55 | 148 |
| Oudorla | city | Western | Papua New Guinea | -8.98 | 142.90 | 111 | 149 |
| Owensnana | city | Western | Papua New Guinea | -6.30 | 141.70 | 321 | 149 |
| Owobi | city | Western | Papua New Guinea | -6.27 | 142.45 | 1000 | 149 |
| Oyamtobip | city | Western | Papua New Guinea | -5.12 | 141.20 | 5029 | 149 |
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