| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oggomuwa | city | Central Province | Sri Lanka | 7.5333333 | 80.9333333 | 393 | 34487 |
| Ogodapola | city | Central Province | Sri Lanka | 7.3666667 | 80.5166667 | 951 | 73905 |
| Olaganwatta | city | Central Province | Sri Lanka | 7.65 | 80.6 | 1351 | 30963 |
| Old Peradeniya | city | Central Province | Sri Lanka | 7.2630556 | 80.6027778 | 1630 | 75752 |
| Oligama | city | Central Province | Sri Lanka | 7.7166667 | 80.5833333 | 1007 | 32640 |
| Oluwawatta | city | Central Province | Sri Lanka | 7.2 | 80.7333333 | 2627 | 73130 |
| Opalagala | city | Central Province | Sri Lanka | 7.6175 | 80.6894444 | 1925 | 30314 |
| Opalgala | city | Central Province | Sri Lanka | 7.6175 | 80.6894444 | 1925 | 30314 |
| Opalgalawatta | city | Central Province | Sri Lanka | 7.55 | 80.6666667 | 1637 | 30318 |
| Opalla | city | Central Province | Sri Lanka | 7.3833333 | 80.5 | 971 | 67441 |
| Otagama | city | Central Province | Sri Lanka | 7.2833333 | 80.8833333 | 2109 | 75752 |
| Otalawa | city | Central Province | Sri Lanka | 7.0666667 | 80.6666667 | 2696 | 65626 |
| Ovisa | city | Central Province | Sri Lanka | 7.3833333 | 80.6 | 1945 | 60449 |
| Owala | city | Central Province | Sri Lanka | 7.2666667 | 80.5666667 | 1948 | 75528 |
| Owala | city | Central Province | Sri Lanka | 7.5166667 | 80.65 | 1374 | 30321 |
| Owalapolwatta | city | Central Province | Sri Lanka | 7.5333333 | 80.6333333 | 1361 | 30321 |
| Owisa | city | Central Province | Sri Lanka | 7.3833333 | 80.6 | 1945 | 60449 |
| Oyatenna | city | Central Province | Sri Lanka | 7.35 | 80.9166667 | 1112 | 72461 |
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