UpAlphabetical listing of Places in Western
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Obberiya | city | Western | Sri Lanka | 7.27 | 79.87 | 19 | 209716 |
| Ogodapola | city | Western | Sri Lanka | 7.10 | 80.10 | 314 | 156863 |
| Okanduwa | city | Western | Sri Lanka | 6.69 | 80.02 | 232 | 134169 |
| Olabaduwa | city | Western | Sri Lanka | 6.77 | 80.03 | 295 | 190339 |
| Olaboduwa | city | Western | Sri Lanka | 6.77 | 80.03 | 295 | 190339 |
| Omatta | city | Western | Sri Lanka | 6.56 | 80.18 | 830 | 37113 |
| Opalla | city | Western | Sri Lanka | 6.70 | 80.13 | 216 | 45557 |
| Opalla West | city | Western | Sri Lanka | 6.70 | 80.13 | 216 | 45557 |
| Opata | city | Western | Sri Lanka | 7.13 | 79.92 | 19 | 229076 |
| Opatha | city | Western | Sri Lanka | 7.13 | 79.92 | 19 | 229076 |
| Opathella | city | Western | Sri Lanka | 7.08 | 80.10 | 337 | 177586 |
| Oritiyawa | city | Western | Sri Lanka | 7.27 | 79.85 | 6 | 164777 |
| Orugodawatta | city | Western | Sri Lanka | 6.95 | 79.87 | 16 | 226818 |
| Orutota | city | Western | Sri Lanka | 7.08 | 79.98 | 62 | 203049 |
| Oruwala | city | Western | Sri Lanka | 6.89 | 80.00 | 239 | 216503 |
| Oruwela | city | Western | Sri Lanka | 6.89 | 80.00 | 239 | 216503 |
| Otaravadiya | city | Western | Sri Lanka | 7.27 | 79.93 | 42 | 117837 |
| Otarawadiya | city | Western | Sri Lanka | 7.27 | 79.93 | 42 | 117837 |
| Otarawadiya Upper | city | Western | Sri Lanka | 7.27 | 79.93 | 42 | 117837 |
| Oterawadiya Lower | city | Western | Sri Lanka | 7.29 | 79.95 | 49 | 77658 |
| Ovitigama | city | Western | Sri Lanka | 6.84 | 80.05 | 830 | 331857 |
| Owitigala | city | Western | Sri Lanka | 6.50 | 80.12 | 830 | 65755 |
| Owitigama | city | Western | Sri Lanka | 6.97 | 80.11 | 49 | 316073 |
| Owitigama | city | Western | Sri Lanka | 6.84 | 80.05 | 830 | 331857 |
| Owitiyagala | city | Western | Sri Lanka | 6.73 | 80.05 | 301 | 74141 |
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