| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onglé | city | Guera | Chad | 11.43 | 18.35 | 1889 | 596 |
| Ongolé | city | Guera | Chad | 11.43 | 18.35 | 1889 | 596 |
| Ongtanian | city | Mandoul | Chad | 8.30 | 17.73 | 1190 | 2235 |
| Onio | city | Moyen-Chari | Chad | 9.61 | 19.19 | 1187 | 2086 |
| Onoko | city | Chari-Baguirmi | Chad | 10.91 | 15.63 | 958 | 2738 |