UpAlphabetical listing of Places in Northern
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oddankulam | city | Northern | Sri Lanka | 9.12 | 80.27 | 75 | 6165 |
| Oddaruthakulam | city | Northern | Sri Lanka | 9.13 | 80.33 | 104 | 6109 |
| Oddaruttakulam | city | Northern | Sri Lanka | 9.13 | 80.33 | 104 | 6109 |
| Oddichuddan | city | Northern | Sri Lanka | 9.15 | 80.65 | 114 | 6220 |
| Odduchuddan | city | Northern | Sri Lanka | 9.15 | 80.65 | 114 | 6220 |
| Oddupeli | city | Northern | Sri Lanka | 9.66 | 80.26 | 3 | 40996 |
| Oddusudan | city | Northern | Sri Lanka | 9.15 | 80.65 | 114 | 6220 |
| Oddusuddan | city | Northern | Sri Lanka | 9.15 | 80.65 | 114 | 6220 |
| Olaithoduvai | city | Northern | Sri Lanka | 9.03 | 79.83 | 19 | 4871 |
| Olaittoduvai | city | Northern | Sri Lanka | 9.03 | 79.83 | 19 | 4871 |
| Olaittoduvl | city | Northern | Sri Lanka | 9.03 | 79.83 | 19 | 4871 |
| Olimadu | city | Northern | Sri Lanka | 9.15 | 80.49 | 134 | 6257 |
| Ollimadu | city | Northern | Sri Lanka | 8.85 | 79.97 | 13 | 8847 |
| Olukkulam | city | Northern | Sri Lanka | 9.10 | 80.10 | 3 | 7511 |
| Olukkulam | city | Northern | Sri Lanka | 8.67 | 80.40 | 239 | 8620 |
| Olumadu | city | Northern | Sri Lanka | 9.15 | 80.49 | 134 | 6257 |
| Olumadu | city | Northern | Sri Lanka | 8.66 | 80.32 | 209 | 8046 |
| Olumadu | city | Northern | Sri Lanka | 9.02 | 80.66 | 177 | 7895 |
| Omantai | city | Northern | Sri Lanka | 8.86 | 80.50 | 285 | 9367 |
| Omantai Town | city | Northern | Sri Lanka | 8.86 | 80.50 | 285 | 9367 |
| Othiyamalai | city | Northern | Sri Lanka | 9.05 | 80.71 | 118 | 7024 |
| Otiyamalai | city | Northern | Sri Lanka | 9.05 | 80.71 | 118 | 7024 |
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