| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oacari | city | Amazonas | Brazil | -3.88 | -58.62 | 170 | 149 |
| Oacary | city | Amazonas | Brazil | -3.88 | -58.62 | 170 | 149 |
| Oampo Alegre | city | Rio Grande do Sul | Brazil | -27.63 | -54.63 | 830 | 2778 |
| Oari | city | Para | Brazil | -6.80 | -57.35 | 328 | 0 |
| Oasis | city | Sao Paulo | Brazil | -21.42 | -51.52 | 1059 | 15425 |
| Oasis | city | Piaui | Brazil | -6.30 | -41.30 | 1190 | 0 |
| Oassara | city | Rondonia | Brazil | -13.22 | -62.10 | 830 | 0 |