| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ofaina | city | Faritany d' Antsiranana | Madagascar | -14.45 | 50.0833333 | 505 | 10536 |
| Onara | city | Faritanin' i Mahajanga | Madagascar | -17.15 | 44.2 | 6 | 613 |
| Onaramaty | city | Faritanin' i Mahajanga | Madagascar | -17.1 | 44.15 | 0 | 265 |
| Ongatsy | city | Faritanin' i Fianarantsoa | Madagascar | -22.4 | 47.9 | 3 | 14147 |
| Oninarivo | city | Faritanin' i Fianarantsoa | Madagascar | -21.3833333 | 46.05 | 2047 | 293 |
| Onisoa | city | Faritanin' i Fianarantsoa | Madagascar | -21.5 | 46.0166667 | 2732 | 271 |
| Onjatsy | city | Faritanin' i Fianarantsoa | Madagascar | -22.4 | 47.9 | 3 | 14147 |
| Orangea | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Orangia | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Orangéa | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Orarikely | city | Faritanin' i Mahajanga | Madagascar | -14.65 | 47.75 | 475 | 558 |
| Orongea | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Orongéa | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Oronjia | city | Faritany d' Antsiranana | Madagascar | -12.2333333 | 49.35 | 377 | 5539 |
| Ovaribe | city | Faritanin' i Mahajanga | Madagascar | -14.6666667 | 47.7333333 | 479 | 458 |
| Ovarikely | city | Faritanin' i Mahajanga | Madagascar | -14.65 | 47.75 | 475 | 558 |
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