| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oio | city | Soloman Islands | -9.10 | 161.21 | 29 | 1383 | |
| Oio | city | New Zealand | -39.05 | 175.42 | 2568 | 156 | |
| Oiobe | city | Huambo | Angola | -12.20 | 15.18 | 5396 | 5811 |
| Oiomamania | city | Milne Bay | Papua New Guinea | -10.62 | 150.16 | 298 | 1425 |
| Oion / Oyón | city | Euskadi | Spain | 42.51 | -2.44 | 1669 | 52159 |
| Oiongge | city | Nusa Tenggara Barat | Indonesia | -8.73 | 118.69 | 393 | 16796 |
| Oiouguenguent | city | Marrakech-Tensift-Al Haouz | Morocco | 31.16 | -9.26 | 4189 | 7884 |
| Oioukerte | city | Souss-Massa-Draa | Morocco | 29.94 | -8.86 | 4189 | 4190 |