| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obelisco la Concordia | city | Tacna | Peru | -18.31 | -70.34 | 285 | 15874 |
| Oconchay | city | Tacna | Peru | -17.53 | -70.61 | 4189 | 386 |
| Ojialaco | city | Tacna | Peru | -17.76 | -70.07 | 6811 | 149 |
| Ovejuyo | city | Tacna | Peru | -17.34 | -69.53 | 13799 | 210 |