| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Olivar | city | Departamento de La Libertad | Peru | -7.9 | -78.7833333 | 5820 | 15547 |
| Ollocopamba | city | Departamento de La Libertad | Peru | -7.8769444 | -77.9077778 | 11190 | 6955 |
| Ongon | city | Departamento de La Libertad | Peru | -8.1652778 | -76.9738889 | 7096 | 1901 |
| Ongón | city | Departamento de La Libertad | Peru | -8.1652778 | -76.9738889 | 7096 | 1901 |
| Oregano | city | Departamento de La Libertad | Peru | -8.2333333 | -78.3666667 | 11810 | 2506 |
| Orogolday | city | Departamento de La Libertad | Peru | -8.011111 | -77.7944444 | 12030 | 3119 |
| Otuzco | city | Departamento de La Libertad | Peru | -7.9 | -78.5833333 | 8832 | 6860 |
| Ouiruvilca | city | Departamento de La Libertad | Peru | -7.9666667 | -78.2 | 12926 | 3445 |