| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Brien | city | Buenos Aires | Argentina | -34.90 | -60.75 | 203 | 1770 |
| O'Higgins | city | Buenos Aires | Argentina | -34.58 | -60.70 | 209 | 5961 |
| O. Aballe | city | Buenos Aires | Argentina | -39.14 | -62.62 | 59 | 0 |
| O. Basualdo | city | Buenos Aires | Argentina | -34.03 | -60.65 | 213 | 306 |
| O. Magnasco | city | Entre Rios | Argentina | -31.31 | -58.06 | 190 | 42379 |
| OBERA | airport | Argentina | -27.52 | -55.12 | 1125 | 0 | |
| OES (ANTOINE DE ST EXUPERY) | airport | Argentina | -40.75 | -65.03 | 85 | 0 | |
| OLAVARRIA | airport | Argentina | -36.89 | -60.22 | 551 | 0 | |
| ORA (ORAN) | airport | Argentina | -23.15 | -64.33 | 1168 | 0 | |
| ORAN | airport | Argentina | -23.15 | -64.33 | 1168 | 0 | |
| OVR (OLAVARRIA) | airport | Argentina | -36.89 | -60.22 | 551 | 0 | |
| OYA (GOYA) | airport | Argentina | -29.10 | -59.25 | 125 | 0 | |
| OYO (TRES ARROYOS) | airport | Argentina | -38.39 | -60.33 | 400 | 0 | |
| Oasis | city | Misiones | Argentina | -26.96 | -55.22 | 305 | 5506 |
| Obanta | city | Catamarca | Argentina | -28.17 | -65.40 | 1804 | 267 |
| Obanta | city | Tucuman | Argentina | -26.87 | -65.30 | 1249 | 144770 |
| Oberá | city | Misiones | Argentina | -27.49 | -55.12 | 1207 | 44842 |
| Obispo Trejo | city | Cordoba | Argentina | -30.78 | -63.41 | 830 | 0 |
| Obligado | city | Buenos Aires | Argentina | -33.60 | -59.82 | 13 | 676 |
| Obraje | city | Formosa | Argentina | -25.73 | -59.65 | 269 | 236 |
| Obraje | city | La Rioja | Argentina | -30.30 | -66.57 | 1669 | 0 |
| Obraje Abatos | city | Santiago del Estero | Argentina | -26.40 | -64.03 | 830 | 298 |
| Obraje Coati | city | Formosa | Argentina | -25.73 | -59.65 | 269 | 236 |
| Obraje Cue | city | Formosa | Argentina | -25.56 | -59.09 | 223 | 447 |
| Obraje Kilometro 72 | city | Formosa | Argentina | -25.92 | -59.75 | 262 | 149 |
| Obraje La Sucursal | city | Formosa | Argentina | -25.79 | -59.72 | 255 | 149 |
| Obraje San Enrique | city | Santiago del Estero | Argentina | -26.39 | -63.01 | 830 | 0 |
| Obraje San Pedro | city | Santiago del Estero | Argentina | -26.53 | -62.87 | 830 | 2530 |
| Ocampo | city | Santa Fe | Argentina | -28.49 | -59.36 | 200 | 12917 |
| Ochandio | city | Buenos Aires | Argentina | -38.36 | -59.79 | 318 | 0 |
| Oetling | city | Chaco | Argentina | -27.40 | -60.02 | 249 | 0 |
| Ogilvie | city | Santa Fe | Argentina | -29.36 | -60.19 | 157 | 173 |
| Ojeda | city | La Pampa | Argentina | -35.31 | -64.01 | 830 | 257 |
| Ojito | city | Santiago del Estero | Argentina | -26.16 | -64.30 | 1040 | 825 |
| Ojo Agua | city | San Luis | Argentina | -32.61 | -65.83 | 4189 | 0 |
| Ojo de Agua | city | Santiago del Estero | Argentina | -29.50 | -63.69 | 1669 | 6001 |
| Ojo de Agua | city | San Luis | Argentina | -32.61 | -65.83 | 4189 | 0 |
| Ojo de Agua | city | Cordoba | Argentina | -31.21 | -65.25 | 3349 | 149 |
| Ojo de Agua | city | Cordoba | Argentina | -31.07 | -65.07 | 2509 | 210 |
| Ojo de Agua | city | Cordoba | Argentina | -30.62 | -64.38 | 3349 | 298 |
| Ojo de Agua | city | Cordoba | Argentina | -30.46 | -64.14 | 2509 | 0 |
| Ojo de Agua | city | Catamarca | Argentina | -28.47 | -65.45 | 3425 | 348 |
| Ojo de Agua | city | Neuquen | Argentina | -39.08 | -70.07 | 3349 | 149 |
| Ojo de Agua | city | Cordoba | Argentina | -31.80 | -65.06 | 3349 | 542 |
| Ojo de Agua Norte | city | Cordoba | Argentina | -30.46 | -64.14 | 2509 | 0 |
| Ojo de Huancar | city | Salta | Argentina | -23.79 | -66.03 | 11174 | 0 |
| Ojo del Aguila | city | Santa Fe | Argentina | -29.03 | -59.97 | 187 | 426 |
| Ojo del Río | city | San Luis | Argentina | -32.43 | -65.20 | 2011 | 376 |
| Ojos de Agua | city | Rio Negro | Argentina | -41.67 | -69.92 | 4189 | 232 |
| Olaen | city | Cordoba | Argentina | -31.16 | -64.60 | 3769 | 745 |
| Olaeta | city | Cordoba | Argentina | -33.05 | -63.91 | 925 | 298 |
| Olain | city | Cordoba | Argentina | -31.16 | -64.60 | 3769 | 745 |
| Olaroz Chico | city | Jujuy | Argentina | -23.40 | -66.80 | 13484 | 0 |
| Olaroz Grande | city | Jujuy | Argentina | -23.32 | -66.78 | 13428 | 0 |
| Olascoaga | city | Buenos Aires | Argentina | -35.24 | -60.61 | 190 | 447 |
| Olavarija | city | Buenos Aires | Argentina | -36.89 | -60.32 | 830 | 19394 |
| Olavarría | city | Buenos Aires | Argentina | -36.89 | -60.32 | 830 | 19394 |
| Olavarría | city | Buenos Aires | Argentina | -35.70 | -63.02 | 278 | 749 |
| Olegario V. Andrade | city | Entre Rios | Argentina | -32.33 | -59.45 | 213 | 634 |
| Olegario V. Andrade | city | Misiones | Argentina | -27.57 | -55.50 | 830 | 3317 |
| Oliden | city | Buenos Aires | Argentina | -35.18 | -57.95 | 65 | 564 |
| Oliva | city | Cordoba | Argentina | -32.04 | -63.57 | 830 | 12093 |
| Olivera | city | Buenos Aires | Argentina | -34.62 | -59.25 | 85 | 2472 |
| Oliveros | city | Santa Fe | Argentina | -32.58 | -60.85 | 22 | 2504 |
| Olivia | city | Cordoba | Argentina | -32.04 | -63.57 | 830 | 12093 |
| Olivos | city | Buenos Aires | Argentina | -34.51 | -58.49 | 6 | 479351 |
| Olmos | city | Cordoba | Argentina | -33.50 | -63.16 | 387 | 298 |
| Oloma | city | Santiago del Estero | Argentina | -28.15 | -63.23 | 370 | 1716 |
| Olpas | city | La Rioja | Argentina | -30.81 | -66.24 | 1715 | 820 |
| Olta | city | La Rioja | Argentina | -30.63 | -66.26 | 1669 | 3696 |
| Ombu | city | Buenos Aires | Argentina | -37.13 | -62.03 | 830 | 149 |
| Ombucito | city | Corrientes | Argentina | -29.67 | -57.12 | 160 | 4747 |
| Ombucta | city | Buenos Aires | Argentina | -38.91 | -62.54 | 75 | 0 |
| Ombucto | city | Buenos Aires | Argentina | -38.91 | -62.54 | 75 | 0 |
| Ombú | city | Santa Fe | Argentina | -31.01 | -60.91 | 127 | 446 |
| Ombú Loma | city | Corrientes | Argentina | -27.63 | -57.80 | 209 | 447 |
| Onagoity | city | Cordoba | Argentina | -34.77 | -63.67 | 830 | 149 |
| Oncativo | city | Cordoba | Argentina | -31.91 | -63.68 | 892 | 12781 |
| Once | city | Buenos Aires | Argentina | -34.60 | -58.42 | 65 | 1182216 |
| Ongamira | city | Cordoba | Argentina | -30.78 | -64.43 | 4189 | 205 |
| Open Door | city | Buenos Aires | Argentina | -34.49 | -59.08 | 101 | 20515 |
| Oran | city | Tucuman | Argentina | -27.09 | -65.03 | 1043 | 1935 |
| Oratorio | city | Santiago del Estero | Argentina | -29.14 | -63.38 | 298 | 212 |
| Oratorio | city | Jujuy | Argentina | -22.10 | -66.13 | 12808 | 589 |
| Oratorio Morante | city | Santa Fe | Argentina | -33.43 | -60.41 | 167 | 840 |
| Oratorio Moreno | city | Jujuy | Argentina | -23.85 | -65.83 | 11955 | 781 |
| Orco Bola | city | La Rioja | Argentina | -28.83 | -67.25 | 10068 | 0 |
| Orco Tucuna | city | Santiago del Estero | Argentina | -29.07 | -63.63 | 830 | 149 |
| Orcos | city | Santiago del Estero | Argentina | -29.17 | -63.62 | 898 | 149 |
| Orcosuni | city | Cordoba | Argentina | -30.18 | -64.31 | 2509 | 121 |
| Ordoqui | city | Buenos Aires | Argentina | -35.88 | -61.16 | 262 | 298 |
| Ordóñez | city | Cordoba | Argentina | -32.84 | -62.87 | 830 | 2552 |
| Orense | city | Buenos Aires | Argentina | -38.68 | -59.78 | 91 | 2290 |
| Oriente | city | Buenos Aires | Argentina | -38.74 | -60.61 | 131 | 1627 |
| Oro Grueso | city | Cordoba | Argentina | -31.05 | -64.82 | 4189 | 298 |
| Oro Pampa | city | Santiago del Estero | Argentina | -28.20 | -64.05 | 830 | 704 |
| Oro Verde | city | Entre Rios | Argentina | -31.83 | -60.52 | 265 | 41610 |
| Orono | city | Santa Fe | Argentina | -31.92 | -61.10 | 124 | 596 |
| Orosmayo | city | Jujuy | Argentina | -22.56 | -66.35 | 12693 | 0 |
| Ortega | city | Cordoba | Argentina | -34.43 | -64.13 | 830 | 149 |
| Ortiz Basualdo | city | Buenos Aires | Argentina | -34.03 | -60.65 | 213 | 306 |
| Ortiz de Rosas | city | Buenos Aires | Argentina | -35.41 | -60.38 | 183 | 298 |
| Ortiz de Rozas | city | Buenos Aires | Argentina | -35.41 | -60.38 | 183 | 298 |
| Orán | city | Salta | Argentina | -23.13 | -64.32 | 1095 | 57269 |
| Orán | city | Tucuman | Argentina | -27.18 | -65.54 | 1122 | 19074 |
| Osma | city | Salta | Argentina | -25.20 | -65.50 | 4494 | 460 |
| Ostende | city | Buenos Aires | Argentina | -37.13 | -56.87 | 3 | 14761 |
| Ostendi | city | Buenos Aires | Argentina | -37.13 | -56.87 | 3 | 14761 |
| Osvaldo Magnasco | city | Entre Rios | Argentina | -31.31 | -58.06 | 190 | 42379 |
| Otamendi | city | Buenos Aires | Argentina | -34.23 | -58.91 | 26 | 17018 |
| Otumpa | city | Santiago del Estero | Argentina | -27.32 | -62.22 | 830 | 0 |
| Ovando | city | Salta | Argentina | -25.83 | -65.09 | 3349 | 0 |
| Ovanta | city | Catamarca | Argentina | -28.17 | -65.40 | 1804 | 267 |
| Ovara | city | Jujuy | Argentina | -23.10 | -65.40 | 10908 | 149 |
| Oveja | city | Formosa | Argentina | -22.97 | -62.10 | 830 | 298 |
| Ovejería | city | Mendoza | Argentina | -34.68 | -67.27 | 1669 | 149 |
| Ovejería | city | Catamarca | Argentina | -26.26 | -66.20 | 11122 | 149 |
| Oyolas | city | Catamarca | Argentina | -28.48 | -65.41 | 2929 | 451 |
| O’Brien | city | Buenos Aires | Argentina | -34.90 | -60.75 | 203 | 1770 |
| O’Higgins | city | Buenos Aires | Argentina | -34.58 | -60.70 | 209 | 5961 |