| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oddaimavadi | city | North Eastern Province | Sri Lanka | 7.9166667 | 81.5166667 | 3 | 19148 |
| Oddamavadi | city | North Eastern Province | Sri Lanka | 7.9166667 | 81.5166667 | 3 | 19148 |
| Oddankulam | city | North Eastern Province | Sri Lanka | 9.1166667 | 80.2666667 | 75 | 5648 |
| Oddaruthakulam | city | North Eastern Province | Sri Lanka | 9.1333333 | 80.3333333 | 104 | 5381 |
| Oddaruttakulam | city | North Eastern Province | Sri Lanka | 9.1333333 | 80.3333333 | 104 | 5381 |
| Oddichuddan | city | North Eastern Province | Sri Lanka | 9.15 | 80.65 | 114 | 5676 |
| Oddiyadimady | city | North Eastern Province | Sri Lanka | 8.7833333 | 81.0833333 | 16 | 17243 |
| Odduchuddan | city | North Eastern Province | Sri Lanka | 9.15 | 80.65 | 114 | 5676 |
| Oddumadu | city | North Eastern Province | Sri Lanka | 8.1333333 | 81.4333333 | 9 | 13337 |
| Oddupeli | city | North Eastern Province | Sri Lanka | 9.65 | 80.25 | 3 | 59487 |
| Oddusudan | city | North Eastern Province | Sri Lanka | 9.15 | 80.65 | 114 | 5676 |
| Oddusuddan | city | North Eastern Province | Sri Lanka | 9.15 | 80.65 | 114 | 5676 |
| Okanda | city | North Eastern Province | Sri Lanka | 6.65 | 81.7666667 | 29 | 9594 |
| Okanta | city | North Eastern Province | Sri Lanka | 6.65 | 81.7666667 | 29 | 9594 |
| Olaithoduvai | city | North Eastern Province | Sri Lanka | 9.0333333 | 79.8333333 | 19 | 4202 |
| Olaittoduvai | city | North Eastern Province | Sri Lanka | 9.0333333 | 79.8333333 | 19 | 4202 |
| Olaittoduvl | city | North Eastern Province | Sri Lanka | 9.0333333 | 79.8333333 | 19 | 4202 |
| Olimadu | city | North Eastern Province | Sri Lanka | 9.15 | 80.4833333 | 127 | 5823 |
| Olimadu | city | North Eastern Province | Sri Lanka | 7.6666667 | 81.5666667 | 154 | 24841 |
| Oliyanyaya | city | North Eastern Province | Sri Lanka | 7.2166667 | 81.65 | 429 | 16637 |
| Ollimadu | city | North Eastern Province | Sri Lanka | 8.85 | 79.9666667 | 13 | 9574 |
| Olukkulam | city | North Eastern Province | Sri Lanka | 9.1 | 80.1 | 3 | 7526 |
| Olukkulam | city | North Eastern Province | Sri Lanka | 8.6666667 | 80.4 | 239 | 9810 |
| Olumadu | city | North Eastern Province | Sri Lanka | 8.6666667 | 80.3166667 | 177 | 8772 |
| Olumadu | city | North Eastern Province | Sri Lanka | 9.15 | 80.4833333 | 127 | 5823 |
| Olumadu | city | North Eastern Province | Sri Lanka | 9.0166667 | 80.6666667 | 180 | 8133 |
| Oluvil | city | North Eastern Province | Sri Lanka | 7.2833333 | 81.85 | 13 | 10789 |
| Omantai | city | North Eastern Province | Sri Lanka | 8.8666667 | 80.5 | 285 | 8769 |
| Omuna | city | North Eastern Province | Sri Lanka | 7.6166667 | 81.2666667 | 465 | 16571 |
| Ondachchimadam | city | North Eastern Province | Sri Lanka | 7.5 | 81.8 | 3 | 11946 |
| Orumulacholai | city | North Eastern Province | Sri Lanka | 7.8 | 81.5833333 | 52 | 22033 |
| Othiyamalai | city | North Eastern Province | Sri Lanka | 9.05 | 80.7 | 131 | 7060 |
| Othiyankuda-aru | city | North Eastern Province | Sri Lanka | 7.6 | 81.6166667 | 334 | 24847 |
| Otiyamalai | city | North Eastern Province | Sri Lanka | 9.05 | 80.7 | 131 | 7060 |
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