UpAlphabetical listing of Places in Peru
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Osacocha | city | Lima | Peru | -11.39 | -76.53 | 13809 | 550 |
| Oscacope | city | Ayacucho | Peru | -12.88 | -74.45 | 13428 | 3991 |
| Oscahuayjo | city | Cusco | Peru | -13.53 | -72.01 | 11866 | 124510 |
| Oscamarca | city | Huancavelica | Peru | -13.85 | -75.25 | 11043 | 1142 |
| Oscar Baca Peréz | city | Ancash | Peru | -9.12 | -78.54 | 3 | 149 |
| Osccollo | city | Ayacucho | Peru | -15.34 | -73.66 | 11108 | 116 |
| Osccollo | city | Arequipa | Peru | -15.42 | -71.07 | 15108 | 165 |
| Osccollo | city | Ayacucho | Peru | -13.77 | -74.23 | 13428 | 1772 |
| Osccollo | city | Apurimac | Peru | -13.64 | -73.71 | 10068 | 2600 |
| Osccollopampa | city | Apurimac | Peru | -13.68 | -73.45 | 10426 | 19270 |
| Osccollopata | city | Cusco | Peru | -14.07 | -71.84 | 12791 | 1737 |
| Osccoyoc | city | Huancavelica | Peru | -12.68 | -74.55 | 10908 | 4828 |
| Osccullerapata | city | Cusco | Peru | -14.70 | -71.54 | 13428 | 1192 |
| Oscohuilca | city | Ayacucho | Peru | -13.05 | -74.10 | 13428 | 4646 |
| Oscolla | city | Lima | Peru | -11.90 | -76.53 | 6253 | 5309 |
| Oscollo | city | Ayacucho | Peru | -15.34 | -73.66 | 11108 | 116 |
| Oscollo | city | Apurimac | Peru | -14.27 | -72.28 | 13428 | 2026 |
| Oscollocancha | city | Cusco | Peru | -13.52 | -72.09 | 12939 | 12585 |
| Oscolloccasa | city | Cusco | Peru | -13.64 | -72.31 | 10908 | 1805 |
| Oscollopampa | city | Cusco | Peru | -13.64 | -72.31 | 10908 | 1885 |
| Oscorayo | city | Ayacucho | Peru | -13.29 | -73.88 | 11810 | 1390 |
| Oscoy | city | Arequipa | Peru | -15.87 | -72.65 | 9228 | 6743 |
| Osculloni | city | Puno | Peru | -14.08 | -69.95 | 13428 | 1300 |
| Oscupucha | city | Huancavelica | Peru | -12.39 | -74.93 | 13428 | 6878 |
| Osgoro | city | Huanuco | Peru | -9.94 | -76.40 | 8389 | 4263 |
| Osgoro | city | Huanuco | Peru | -9.78 | -76.24 | 6709 | 4315 |
| Oshapampa | city | Huanuco | Peru | -9.76 | -76.33 | 7608 | 4605 |
| Oshca | city | Huanuco | Peru | -8.95 | -76.97 | 8789 | 2523 |
| Oshcotuna | city | Pasco | Peru | -10.37 | -76.27 | 12165 | 4028 |
| Oshito | city | San Martin | Peru | -8.41 | -76.41 | 1811 | 7269 |
| Osilin | city | San Martin | Peru | -7.25 | -76.90 | 1669 | 562 |
| Osjollata | city | Ayacucho | Peru | -14.31 | -73.96 | 11873 | 1908 |
| Oslo | city | Junin | Peru | -11.78 | -75.24 | 15124 | 795 |
| Osmore Chico | city | Moquegua | Peru | -17.51 | -71.16 | 3349 | 0 |
| Osmore Grande | city | Moquegua | Peru | -17.52 | -71.16 | 2828 | 0 |
| Osnobamba | city | Apurimac | Peru | -13.95 | -72.44 | 13428 | 2196 |
| Osnomojopata | city | Huancavelica | Peru | -12.75 | -74.92 | 13428 | 15517 |
| Osobaya | city | Moquegua | Peru | -16.94 | -71.33 | 4570 | 92 |
| Osocucho | city | Ayacucho | Peru | -15.48 | -73.92 | 11991 | 245 |
| Osopata | city | Ayacucho | Peru | -13.68 | -74.76 | 13428 | 429 |
| Osoro | city | Ayacucho | Peru | -13.33 | -74.08 | 13428 | 1280 |
| Osotacancha | city | Cusco | Peru | -13.44 | -72.43 | 10068 | 2642 |
| Ospanccan | city | Huancavelica | Peru | -13.78 | -75.23 | 12588 | 1255 |
| Ostopucro | city | Ayacucho | Peru | -14.53 | -73.63 | 15108 | 62 |
| Ostuna | city | Huancavelica | Peru | -13.84 | -74.91 | 13428 | 472 |
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