| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Brien | city | Provincia de Buenos Aires | Argentina | -34.90 | -60.75 | 180 | 1774 |
| O'Higgins | city | Provincia de Buenos Aires | Argentina | -34.58 | -60.70 | 209 | 5981 |
| O. Aballe | city | Provincia de Buenos Aires | Argentina | -39.13 | -62.60 | 29 | 0 |
| O. Basualdo | city | Provincia de Buenos Aires | Argentina | -34.03 | -60.67 | 213 | 322 |
| O. Magnasco | city | Provincia de Entre Rios | Argentina | -31.32 | -58.05 | 173 | 51552 |
| 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 | |
| OLN (Lago Musters Airport) | airport | Argentina | -45.58 | -69.00 | 88 | 0 | |
| ORA (ORAN) | airport | Argentina | -23.15 | -64.33 | 1168 | 0 | |
| ORAN | airport | Argentina | -23.15 | -64.33 | 1168 | 0 | |
| OYA (GOYA) | airport | Argentina | -29.10 | -59.25 | 125 | 0 | |
| OYO (TRES ARROYOS) | airport | Argentina | -38.39 | -60.33 | 400 | 0 | |
| Oasis | city | Provincia de Misiones | Argentina | -26.97 | -55.27 | 511 | 5683 |
| Obanta | city | Provincia de Catamarca | Argentina | -28.17 | -65.40 | 1804 | 267 |
| Obanta | city | Provincia de Tucuman | Argentina | -26.87 | -65.30 | 1249 | 144770 |
| Obera | city | Provincia de Misiones | Argentina | -27.48 | -55.13 | 977 | 43981 |
| Obispo Trejo | city | Provincia de Cordoba | Argentina | -30.77 | -63.42 | 452 | 0 |
| Obligado | city | Provincia de Buenos Aires | Argentina | -33.58 | -59.82 | 9 | 639 |
| Obraje | city | Provincia de Formosa | Argentina | -25.72 | -59.63 | 275 | 317 |
| Obraje | city | Provincia de La Rioja | Argentina | -30.27 | -66.58 | 1459 | 0 |
| Obraje Abatos | city | Provincia de Santiago del Estero | Argentina | -26.40 | -64.03 | 780 | 298 |
| Obraje Coati | city | Provincia de Formosa | Argentina | -25.72 | -59.63 | 275 | 317 |
| Obraje Cué | city | Provincia de Formosa | Argentina | -25.57 | -59.08 | 216 | 447 |
| Obraje Kilometro 72 | city | Provincia de Formosa | Argentina | -25.92 | -59.75 | 262 | 149 |
| Obraje La Sucursal | city | Provincia de Formosa | Argentina | -25.78 | -59.72 | 272 | 149 |
| Obraje San Enrique | city | Provincia de Santiago del Estero | Argentina | -26.38 | -63.03 | 616 | 0 |
| Obraje San Pedro | city | Provincia de Santiago del Estero | Argentina | -26.53 | -62.87 | 590 | 2530 |
| Ocampo | city | Provincia de Santa Fe | Argentina | -28.47 | -59.37 | 190 | 10562 |
| Ochandio | city | Provincia de Buenos Aires | Argentina | -38.35 | -59.78 | 318 | 0 |
| Oetling | city | Provincia del Chaco | Argentina | -27.40 | -60.02 | 249 | 0 |
| Oficial Subinspector Gustavo Soarez De Souza Heliport | airport | Argentina | -34.72 | -58.52 | 141 | 0 | |
| Ogilvie | city | Provincia de Santa Fe | Argentina | -29.35 | -60.20 | 157 | 149 |
| Ojeda | city | Provincia de La Pampa | Argentina | -35.33 | -64.00 | 423 | 257 |
| Ojito | city | Provincia de Santiago del Estero | Argentina | -26.18 | -64.30 | 1023 | 298 |
| Ojo Agua | city | Provincia de San Luis | Argentina | -32.62 | -65.83 | 4094 | 0 |
| Ojo de Agua | city | Provincia de Santiago del Estero | Argentina | -29.52 | -63.70 | 1656 | 5634 |
| Ojo de Agua | city | Provincia de San Luis | Argentina | -32.62 | -65.83 | 4094 | 0 |
| Ojo de Agua | city | Provincia de Cordoba | Argentina | -31.22 | -65.25 | 3248 | 149 |
| Ojo de Agua | city | Provincia de Cordoba | Argentina | -31.07 | -65.07 | 2303 | 210 |
| Ojo de Agua | city | Provincia de Cordoba | Argentina | -30.62 | -64.40 | 3129 | 298 |
| Ojo de Agua | city | Provincia de Cordoba | Argentina | -30.45 | -64.13 | 2188 | 0 |
| Ojo de Agua | city | Provincia de Catamarca | Argentina | -28.47 | -65.45 | 3425 | 348 |
| Ojo de Agua | city | Provincia del Neuquen | Argentina | -39.08 | -70.07 | 3270 | 149 |
| Ojo de Agua | city | Provincia de Cordoba | Argentina | -31.78 | -65.03 | 2913 | 3282 |
| Ojo de Agua Norte | city | Provincia de Cordoba | Argentina | -30.45 | -64.13 | 2188 | 0 |
| Ojo de Huancar | city | Provincia de Salta | Argentina | -23.78 | -66.02 | 11164 | 0 |
| Ojo del Aguila | city | Provincia de Santa Fe | Argentina | -29.03 | -59.97 | 187 | 426 |
| Ojo del Río | city | Provincia de San Luis | Argentina | -32.45 | -65.20 | 2047 | 499 |
| Ojos de Agua | city | Provincia de Rio Negro | Argentina | -41.67 | -69.92 | 4160 | 232 |
| Olaen | city | Provincia de Cordoba | Argentina | -31.17 | -64.62 | 3435 | 745 |
| Olaeta | city | Provincia de Cordoba | Argentina | -33.05 | -63.92 | 928 | 298 |
| Olain | city | Provincia de Cordoba | Argentina | -31.17 | -64.62 | 3435 | 745 |
| Olaroz Chico | city | Provincia de Jujuy | Argentina | -23.47 | -66.82 | 14911 | 561 |
| Olaroz Grande | city | Provincia de Jujuy | Argentina | -23.37 | -66.87 | 15295 | 0 |
| Olascoaga | city | Provincia de Buenos Aires | Argentina | -35.20 | -60.60 | 177 | 447 |
| Olavarria Aeroclub Airport | airport | Argentina | -36.96 | -60.28 | 606 | 0 | |
| Olavarría | city | Provincia de Buenos Aires | Argentina | -36.90 | -60.28 | 534 | 19817 |
| Olavarría | city | Provincia de Buenos Aires | Argentina | -35.70 | -63.00 | 321 | 749 |
| Olegario V. Andrade | city | Provincia de Entre Rios | Argentina | -32.33 | -59.45 | 213 | 302 |
| Olegario V. Andrade | city | Provincia de Misiones | Argentina | -27.57 | -55.50 | 633 | 3977 |
| Oliden | city | Provincia de Buenos Aires | Argentina | -35.18 | -57.95 | 65 | 564 |
| Oliva | city | Provincia de Cordoba | Argentina | -32.05 | -63.57 | 820 | 12077 |
| Oliva Airport | airport | Argentina | -32.06 | -63.55 | 879 | 0 | |
| Olivera | city | Provincia de Buenos Aires | Argentina | -34.63 | -59.25 | 98 | 2974 |
| Oliveros | city | Provincia de Santa Fe | Argentina | -32.57 | -60.85 | 22 | 2504 |
| Olivia | city | Provincia de Cordoba | Argentina | -32.05 | -63.57 | 820 | 12077 |
| Olivos | city | Provincia de Buenos Aires | Argentina | -34.51 | -58.50 | 62 | 602683 |
| Olmos | city | Provincia de Cordoba | Argentina | -33.50 | -63.17 | 387 | 298 |
| Oloma | city | Provincia de Santiago del Estero | Argentina | -28.15 | -63.23 | 370 | 1716 |
| Olpas | city | Provincia de La Rioja | Argentina | -30.80 | -66.25 | 1745 | 820 |
| Olta | city | Provincia de La Rioja | Argentina | -30.62 | -66.27 | 1840 | 3696 |
| Ombu Loma | city | Provincia de Corrientes | Argentina | -27.63 | -57.80 | 209 | 447 |
| Ombucito | city | Provincia de Corrientes | Argentina | -29.65 | -57.13 | 127 | 3022 |
| Ombucta | city | Provincia de Buenos Aires | Argentina | -38.90 | -62.53 | 68 | 0 |
| Ombucto | city | Provincia de Buenos Aires | Argentina | -38.90 | -62.53 | 68 | 0 |
| Ombú | city | Provincia de Buenos Aires | Argentina | -37.13 | -62.03 | 554 | 149 |
| Ombú | city | Provincia de Santa Fe | Argentina | -31.02 | -60.90 | 157 | 446 |
| Onagoity | city | Provincia de Cordoba | Argentina | -34.77 | -63.67 | 439 | 149 |
| Oncativo | city | Provincia de Cordoba | Argentina | -31.92 | -63.67 | 879 | 12903 |
| Once | city | Distrito Federal | Argentina | -34.60 | -58.42 | 65 | 1182216 |
| Ongamira | city | Provincia de Cordoba | Argentina | -30.77 | -64.43 | 4379 | 218 |
| Open Door | city | Provincia de Buenos Aires | Argentina | -34.50 | -59.08 | 91 | 23234 |
| Oratorio | city | Provincia de Santiago del Estero | Argentina | -29.15 | -63.37 | 314 | 211 |
| Oratorio | city | Provincia de Jujuy | Argentina | -22.08 | -66.12 | 12644 | 589 |
| Oratorio Morante | city | Provincia de Santa Fe | Argentina | -33.42 | -60.40 | 137 | 897 |
| Oratorio Moreno | city | Provincia de Jujuy | Argentina | -23.87 | -65.80 | 12237 | 781 |
| Orco Bola | city | Provincia de La Rioja | Argentina | -28.83 | -67.25 | 9717 | 0 |
| Orco Tucuna | city | Provincia de Santiago del Estero | Argentina | -29.07 | -63.63 | 459 | 149 |
| Orcos | city | Provincia de Santiago del Estero | Argentina | -29.17 | -63.62 | 898 | 149 |
| Orcosuni | city | Provincia de Cordoba | Argentina | -30.18 | -64.32 | 2201 | 176 |
| Ordonez | city | Provincia de Cordoba | Argentina | -32.83 | -62.87 | 426 | 2552 |
| Ordoqui | city | Provincia de Buenos Aires | Argentina | -35.90 | -61.17 | 275 | 298 |
| Orense | city | Provincia de Buenos Aires | Argentina | -38.67 | -59.78 | 104 | 2290 |
| Oreste Berta Heliport | airport | Argentina | -31.63 | -64.39 | 1869 | 0 | |
| Oriente | city | Provincia de Buenos Aires | Argentina | -38.73 | -60.62 | 137 | 1438 |
| Oro Grueso | city | Provincia de Cordoba | Argentina | -31.05 | -64.82 | 3795 | 298 |
| Oro Pampa | city | Provincia de Santiago del Estero | Argentina | -28.20 | -64.05 | 449 | 704 |
| Oro Verde | city | Provincia de Entre Rios | Argentina | -31.82 | -60.52 | 239 | 48264 |
| Orosmayo | city | Provincia de Jujuy | Argentina | -22.58 | -66.35 | 13494 | 0 |
| Oroño | city | Provincia de Santa Fe | Argentina | -31.92 | -61.10 | 124 | 596 |
| Ortega | city | Provincia de Cordoba | Argentina | -34.43 | -64.13 | 557 | 149 |
| Ortiz Basualdo | city | Provincia de Buenos Aires | Argentina | -34.03 | -60.67 | 213 | 322 |
| Ortiz de Rosas | city | Provincia de Buenos Aires | Argentina | -35.40 | -60.38 | 193 | 298 |
| Ortiz de Rozas | city | Provincia de Buenos Aires | Argentina | -35.40 | -60.38 | 193 | 298 |
| Orán | city | Provincia de Salta | Argentina | -23.13 | -64.33 | 1105 | 52263 |
| Orán | city | Provincia de Tucuman | Argentina | -27.17 | -65.55 | 1108 | 16628 |
| Orán | city | Provincia de Tucuman | Argentina | -27.10 | -65.02 | 1046 | 1937 |
| Osma | city | Provincia de Salta | Argentina | -25.20 | -65.50 | 4494 | 460 |
| Ostende | city | Provincia de Buenos Aires | Argentina | -37.15 | -56.88 | 3 | 13671 |
| Ostendi | city | Provincia de Buenos Aires | Argentina | -37.15 | -56.88 | 3 | 13671 |
| Osvaldo Magnasco | city | Provincia de Entre Rios | Argentina | -31.32 | -58.05 | 173 | 51552 |
| Otamendi | city | Provincia de Buenos Aires | Argentina | -34.23 | -58.86 | 13 | 8901 |
| Otumpa | city | Provincia de Santiago del Estero | Argentina | -27.32 | -62.22 | 459 | 0 |
| Ovando | city | Provincia de Salta | Argentina | -25.80 | -65.10 | 3087 | 0 |
| Ovanta | city | Provincia de Catamarca | Argentina | -28.17 | -65.40 | 1804 | 267 |
| Ovara | city | Provincia de Jujuy | Argentina | -23.12 | -65.42 | 11040 | 149 |
| Oveja | city | Provincia de Formosa | Argentina | -22.97 | -62.10 | 482 | 298 |
| Ovejería | city | Provincia de Mendoza | Argentina | -34.68 | -67.27 | 1420 | 149 |
| Ovejería | city | Provincia de Catamarca | Argentina | -26.25 | -66.20 | 11223 | 149 |
| Oyolas | city | Provincia de Catamarca | Argentina | -28.47 | -65.40 | 2870 | 345 |
| O’Brien | city | Provincia de Buenos Aires | Argentina | -34.90 | -60.75 | 180 | 1774 |
| O’Higgins | city | Provincia de Buenos Aires | Argentina | -34.58 | -60.70 | 209 | 5981 |