| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onio | city | Moyen-Chari | Chad | 9.61 | 19.19 | 1187 | 2086 |
| Oniog-Ono | city | Akwa Ibom | Nigeria | 5.37 | 7.72 | 830 | 28216 |
| Oniombe | city | Sangha | Congo | 0.13 | 16.14 | 1013 | 89 |
| Onion Creek | city | Texas | United States | 32.22 | -96.62 | 377 | |
| Onion Creek | city | Washington | United States | 48.78 | -117.81 | 2591 | |
| Onion Creek | city | Texas | United States | 30.14 | -97.78 | 830 | |
| Onion Lake | city | Saskatchewan | Canada | 53.72 | -110.00 | 1968 | 489 |
| Onion Spring | city | Texas | United States | 29.40 | -103.33 | 3405 | |
| Onionbe | city | Sangha | Congo | 0.13 | 16.14 | 1013 | 89 |
| Onioneouango | city | Comoe | Cote D'Ivoire (Ivory Coast) | 5.33 | -3.55 | 249 | 10288 |
| Oniong | city | Akwa Ibom | Nigeria | 4.80 | 7.81 | 830 | 74118 |
| Oniong Ono | city | Akwa Ibom | Nigeria | 5.37 | 7.72 | 830 | 28216 |
| Onioni | city | Central | Papua New Guinea | -10.35 | 149.51 | 3 | 320 |
| Oniontown | city | New York | United States | 41.72 | -73.58 | 396 | |
| Oniontown | city | New York | United States | 43.12 | -75.83 | 380 | |
| Oniontown | city | Pennsylvania | United States | 41.35 | -80.34 | 1115 | |
| Oniorosu | city | Nigeria | 6.85 | 2.78 | 124 | 19158 | |
| Oniosa | city | Ibaraki | Japan | 35.98 | 140.00 | 29 | 90237 |