| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Obadagahadeniya | city | Southern Province | Sri Lanka | 6.2575 | 80.6722222 | 469 | 47819 |
| Obadawatta | city | Southern Province | Sri Lanka | 6.4166667 | 80 | 3 | 68760 |
| Okandeyaya | city | Southern Province | Sri Lanka | 6.2166667 | 80.7833333 | 426 | 32333 |
| Okawala | city | Southern Province | Sri Lanka | 6.1 | 80.7166667 | 439 | 39395 |
| Okewela | city | Southern Province | Sri Lanka | 6.1 | 80.7166667 | 439 | 39395 |
| Okewelagoda | city | Southern Province | Sri Lanka | 6.1 | 80.7166667 | 439 | 39395 |
| Olagama | city | Southern Province | Sri Lanka | 6.25 | 80.05 | 22 | 54674 |
| Olagama | city | Southern Province | Sri Lanka | 6.15 | 80.1 | 13 | 51574 |
| Olaganduwa | city | Southern Province | Sri Lanka | 6.3833333 | 80.0166667 | 6 | 59355 |
| Oligoda | city | Southern Province | Sri Lanka | 6.3666667 | 80.0166667 | 6 | 48682 |
| Oluara | city | Southern Province | Sri Lanka | 6.1666667 | 80.6833333 | 475 | 37294 |
| Olupeliya | city | Southern Province | Sri Lanka | 6.0833333 | 80.6833333 | 492 | 61958 |
| Omatta | city | Southern Province | Sri Lanka | 6.35 | 80.1666667 | 337 | 90702 |
| Opata | city | Southern Province | Sri Lanka | 6.3666667 | 80.15 | 236 | 90835 |
| Opata | city | Southern Province | Sri Lanka | 6.1 | 80.2 | 164 | 82180 |
| Opata | city | Southern Province | Sri Lanka | 6.2666667 | 80.4 | 495 | 91549 |
| Oture | city | Southern Province | Sri Lanka | 6.0833333 | 80.6833333 | 492 | 61958 |
| Ovilikanda | city | Southern Province | Sri Lanka | 7.45 | 80.5666667 | 2270 | 54385 |
| Ovilla | city | Southern Province | Sri Lanka | 7.45 | 80.5833333 | 2086 | 54385 |
| Ovitipana | city | Southern Province | Sri Lanka | 7.5333333 | 80.6 | 2998 | 32283 |
| Owilana | city | Southern Province | Sri Lanka | 6.0166667 | 80.7333333 | 118 | 37827 |
| Owilikanda | city | Southern Province | Sri Lanka | 7.45 | 80.5666667 | 2270 | 54385 |
| Owilla | city | Southern Province | Sri Lanka | 7.45 | 80.5833333 | 2086 | 54385 |
| Owitigamuwa | city | Southern Province | Sri Lanka | 6.0666667 | 80.6 | 337 | 89711 |
| Owitipana | city | Southern Province | Sri Lanka | 7.5333333 | 80.6 | 2998 | 32283 |
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