UpAlphabetical listing of Places in Peru
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oncca | city | Arequipa | Peru | -15.59 | -71.71 | 14383 | 931 |
| Onceena | city | Huancavelica | Peru | -12.50 | -74.53 | 9228 | 3568 |
| Onconashari | city | Ucayali | Peru | -11.11 | -73.41 | 1863 | 4 |
| Ondaga | city | Loreto | Peru | -4.76 | -77.29 | 830 | 298 |
| Ondol | city | Amazonas | Peru | -6.33 | -78.31 | 6975 | 2380 |
| Ondores | city | Junin | Peru | -11.09 | -76.15 | 13428 | 1226 |
| Ongoro | city | Arequipa | Peru | -15.92 | -72.47 | 5029 | 1066 |
| Ongoro Hacienda | city | Arequipa | Peru | -15.92 | -72.47 | 5029 | 1066 |
| Ongos | city | Lima | Peru | -12.81 | -75.77 | 10908 | 1144 |
| Ongoy | city | Apurimac | Peru | -13.40 | -73.67 | 8658 | 3415 |
| Ongón | city | La Libertad | Peru | -8.17 | -76.97 | 6709 | 1440 |
| Onocora | city | Cusco | Peru | -14.23 | -71.27 | 11988 | 13623 |
| Onono | city | Puno | Peru | -15.62 | -70.58 | 13464 | 298 |
| Onopujro | city | Apurimac | Peru | -13.92 | -72.20 | 13523 | 4024 |
| Ontario | city | Junin | Peru | -11.28 | -74.43 | 2509 | 750 |
| Ontave | city | Puno | Peru | -16.50 | -69.65 | 13428 | 298 |
| Ontave Hacienda | city | Puno | Peru | -16.50 | -69.65 | 13428 | 298 |
| Ontucco | city | Ayacucho | Peru | -15.23 | -73.71 | 11748 | 2606 |
| Ontuco | city | Ayacucho | Peru | -15.23 | -73.71 | 11748 | 2606 |
| Onza | city | Junin | Peru | -11.96 | -74.94 | 11748 | 9469 |
| Onza de Oro | city | Piura | Peru | -5.49 | -80.74 | 19 | 3013 |
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