| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Obokka | city | Province of Sabaragamuwa | Sri Lanka | 6.5166667 | 80.4 | 994 | 44628 |
| Oddape | city | Province of Sabaragamuwa | Sri Lanka | 7.3333333 | 80.3666667 | 456 | 62206 |
| Oddare | city | Province of Sabaragamuwa | Sri Lanka | 7.3333333 | 80.3666667 | 456 | 62206 |
| Okanmulla | city | Province of Sabaragamuwa | Sri Lanka | 6.6833333 | 80.7 | 1981 | 44467 |
| Olagama | city | Province of Sabaragamuwa | Sri Lanka | 7.25 | 80.35 | 987 | 64716 |
| Olitenna | city | Province of Sabaragamuwa | Sri Lanka | 6.7 | 80.7833333 | 1755 | 43735 |
| Olugala | city | Province of Sabaragamuwa | Sri Lanka | 6.7166667 | 80.4333333 | 610 | 44071 |
| Olugantota | city | Province of Sabaragamuwa | Sri Lanka | 6.65 | 80.7166667 | 1971 | 44031 |
| Omalpe | city | Province of Sabaragamuwa | Sri Lanka | 6.3333333 | 80.6833333 | 2001 | 52528 |
| Opanake | city | Province of Sabaragamuwa | Sri Lanka | 6.6127778 | 80.6194444 | 787 | 44034 |
| Opata | city | Province of Sabaragamuwa | Sri Lanka | 7.2833333 | 80.2333333 | 341 | 64752 |
| Opata | city | Province of Sabaragamuwa | Sri Lanka | 6.5666667 | 80.6 | 967 | 44038 |
| Opata | city | Province of Sabaragamuwa | Sri Lanka | 6.5333333 | 80.6666667 | 1003 | 44041 |
| Opatha | city | Province of Sabaragamuwa | Sri Lanka | 7.2833333 | 80.2333333 | 341 | 64752 |
| Otnapitiya | city | Province of Sabaragamuwa | Sri Lanka | 7.2166667 | 80.25 | 498 | 64418 |
| Owala | city | Province of Sabaragamuwa | Sri Lanka | 6.7 | 80.4833333 | 521 | 44027 |
| Owala Kudabage | city | Province of Sabaragamuwa | Sri Lanka | 6.7 | 80.4833333 | 521 | 44027 |
| Owala Mahabage | city | Province of Sabaragamuwa | Sri Lanka | 6.7 | 80.4833333 | 521 | 44027 |
| Owatta | city | Province of Sabaragamuwa | Sri Lanka | 7.3 | 80.3833333 | 469 | 64812 |
| Owatta | city | Province of Sabaragamuwa | Sri Lanka | 7.25 | 80.4666667 | 944 | 67926 |
| Owatura | city | Province of Sabaragamuwa | Sri Lanka | 6.5833333 | 80.7833333 | 610 | 44038 |
| Owitigamuwa | city | Province of Sabaragamuwa | Sri Lanka | 7.1333333 | 80.3833333 | 980 | 64824 |
| Owitiwara | city | Province of Sabaragamuwa | Sri Lanka | 7.3 | 80.3666667 | 469 | 62206 |
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