| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Onan | city | Region des Plateaux | Congo | -1.7244444 | 16.1044444 | 1043 | 635 |
| Onanga | city | Region de la Cuvette | Congo | 0.0633333 | 15.5583333 | 1102 | 336 |
| Onanga | city | Region de la Cuvette | Congo | 0.013889 | 16.3619444 | 997 | 270 |
| Onchouondjoko | city | Region de la Cuvette | Congo | 0.0722222 | 14.2336111 | 1909 | 322 |
| Ondaba | city | Region des Plateaux | Congo | -1.8311111 | 15.8227778 | 1204 | 635 |
| Ondaka | city | Region de la Cuvette | Congo | -0.4558333 | 15.82 | 1095 | 420 |
| Ondama | city | Region de la Lekoumou | Congo | -2.8263889 | 13.8452778 | 1847 | 406 |
| Ondama | city | Region de la Lekoumou | Congo | -2.9469444 | 13.8658333 | 1998 | 406 |
| Ondama I | city | Region de la Lekoumou | Congo | -2.8263889 | 13.8452778 | 1847 | 406 |
| Ondingi | city | Region de la Cuvette | Congo | -1.1297222 | 15.1752778 | 1443 | 507 |
| Ondjouba | city | Region de la Cuvette | Congo | 0.3797222 | 14.7930556 | 1545 | 56 |
| Ondongo | city | Region de la Cuvette | Congo | -0.2222222 | 15.7380556 | 1135 | 360 |
| Ondouna | city | Region de la Cuvette | Congo | -0.9552778 | 14.8472222 | 1751 | 397 |
| Ondza | city | Region de la Cuvette | Congo | -0.0177778 | 15.6875 | 1072 | 336 |
| Ondzala | city | Region des Plateaux | Congo | -1.8038889 | 16.1486111 | 1007 | 635 |
| Ondzatounou | city | Region des Plateaux | Congo | -1.5463889 | 16.0136111 | 1141 | 635 |
| Ondzela | city | Region des Plateaux | Congo | -1.8 | 16.1333333 | 1020 | 635 |
| Ondzeli | city | Region des Plateaux | Congo | -1.6783333 | 16.1141667 | 1040 | 635 |
| Ondzio | city | Region des Plateaux | Congo | -1.5413889 | 15.8936111 | 1249 | 618 |
| Onfounou | city | Region des Plateaux | Congo | -1.5697222 | 15.6155556 | 1358 | 530 |
| Ongali | city | Region de la Cuvette | Congo | -1.4713889 | 14.745 | 1948 | 215 |
| Ongali | city | Region de la Cuvette | Congo | -1.5855556 | 14.7947222 | 1745 | 204 |
| Ongali | city | Region des Plateaux | Congo | -1.5036111 | 15.8033333 | 1282 | 601 |
| Ongali | city | Region des Plateaux | Congo | -1.5072222 | 15.9641667 | 1190 | 631 |
| Ongali | city | Region des Plateaux | Congo | -1.7902778 | 16.0755556 | 1040 | 635 |
| Onganaka | city | Region de la Cuvette | Congo | 0.0836111 | 15.9658333 | 1040 | 336 |
| Ongende | city | Region des Plateaux | Congo | -1.2144444 | 15.6305556 | 1361 | 509 |
| Ongendé | city | Region des Plateaux | Congo | -1.2144444 | 15.6305556 | 1361 | 509 |
| Ongene | city | Region du Pool | Congo | -3.6180556 | 15.2305556 | 2024 | 15664 |
| Ongia | city | Region de la Cuvette | Congo | -1.0638889 | 14.6852778 | 1935 | 386 |
| Ongia | city | Region des Plateaux | Congo | -2.4188889 | 14.9647222 | 2011 | 182 |
| Ongo | city | Region des Plateaux | Congo | -1.6116667 | 16.0466667 | 1095 | 635 |
| Ongo III | city | Region des Plateaux | Congo | -1.6247222 | 16.0527778 | 1095 | 635 |
| Ongomo | city | Region de la Cuvette | Congo | -0.1002778 | 15.6747222 | 1095 | 336 |
| Ongomon | city | Region de la Cuvette | Congo | -0.1002778 | 15.6747222 | 1095 | 336 |
| Ongondza I | city | Region de la Cuvette | Congo | -0.9608333 | 15.3219444 | 1843 | 649 |
| Ongondza II | city | Region de la Cuvette | Congo | -0.9672222 | 15.3183333 | 1847 | 649 |
| Ongonyi | city | Region des Plateaux | Congo | -1.5913889 | 16.0130556 | 1135 | 635 |
| Ongouala | city | Region des Plateaux | Congo | -1.5880556 | 15.9494444 | 1233 | 635 |
| Ongouba | city | Region de la Cuvette | Congo | -0.4666667 | 15.2 | 1345 | 590 |
| Ongoueme | city | Region de la Cuvette | Congo | -0.9572222 | 15.7563889 | 1197 | 423 |
| Ongouli | city | Region des Plateaux | Congo | -1.1791667 | 15.4352778 | 1272 | 509 |
| Ongouli | city | Region des Plateaux | Congo | -1.1663889 | 15.4416667 | 1263 | 509 |
| Ongouli | city | Region des Plateaux | Congo | -1.2094444 | 15.8963889 | 1082 | 508 |
| Ongounda | city | Region de la Cuvette | Congo | 0.1266667 | 14.1741667 | 1850 | 322 |
| Ongoundja | city | Region de la Cuvette | Congo | -0.9608333 | 15.3219444 | 1843 | 649 |
| Ongouoni | city | Region des Plateaux | Congo | -1.5913889 | 16.0130556 | 1135 | 635 |
| Ongouémé | city | Region de la Cuvette | Congo | -0.9572222 | 15.7563889 | 1197 | 423 |
| Ongoy | city | Region des Plateaux | Congo | -1.6141667 | 16.0241667 | 1125 | 635 |
| Ongoye | city | Region des Plateaux | Congo | -1.6005556 | 15.5491667 | 1640 | 520 |
| Ongoye | city | Region des Plateaux | Congo | -1.6141667 | 16.0241667 | 1125 | 635 |
| Onguende | city | Region des Plateaux | Congo | -1.2144444 | 15.6305556 | 1361 | 509 |
| Onguendé | city | Region des Plateaux | Congo | -1.2144444 | 15.6305556 | 1361 | 509 |
| Onguia | city | Region de la Cuvette | Congo | -1.0638889 | 14.6852778 | 1935 | 386 |
| Onguia | city | Region de la Cuvette | Congo | -1.0211111 | 14.87 | 1761 | 397 |
| Onguia | city | Region des Plateaux | Congo | -2.4188889 | 14.9647222 | 2011 | 182 |
| Onguia | city | Region de la Cuvette | Congo | -1.3566667 | 15.0558333 | 1505 | 231 |
| Onguia-Endeli | city | Region de la Cuvette | Congo | -1.0211111 | 14.87 | 1761 | 397 |
| Onguia-Endéli | city | Region de la Cuvette | Congo | -1.0211111 | 14.87 | 1761 | 397 |
| Onguida | city | Region de la Cuvette | Congo | -0.6063889 | 15.7408333 | 1417 | 420 |
| Onguido | city | Region de la Cuvette | Congo | -0.6063889 | 15.7408333 | 1417 | 420 |
| Onguinda | city | Region de la Cuvette | Congo | -0.6063889 | 15.7408333 | 1417 | 420 |
| Ongwala | city | Region des Plateaux | Congo | -1.5880556 | 15.9494444 | 1233 | 635 |
| Ongéne | city | Region du Pool | Congo | -3.6180556 | 15.2305556 | 2024 | 15664 |
| Onia | city | Region de la Cuvette | Congo | -0.0122222 | 15.7775 | 1062 | 336 |
| Onianva | city | Region des Plateaux | Congo | -2.3472222 | 15.8138889 | 1486 | 317 |
| Onienga | city | Region de la Cuvette | Congo | -0.0666667 | 13.9833333 | 2355 | 311 |
| Onienguele | city | Region de la Cuvette | Congo | -0.115 | 15.5605556 | 1099 | 336 |
| Onienguele | city | Region de la Cuvette | Congo | -0.0986111 | 15.5636111 | 1095 | 336 |
| Oningui | city | Region de la Cuvette | Congo | -1.1297222 | 15.1752778 | 1443 | 507 |
| Oniombe | city | Region de la Sangha | Congo | 0.1325 | 16.1375 | 1013 | 202 |
| Oniombé | city | Region de la Sangha | Congo | 0.1325 | 16.1375 | 1013 | 202 |
| Onionbe | city | Region de la Sangha | Congo | 0.1325 | 16.1375 | 1013 | 202 |
| Onionbé | city | Region de la Sangha | Congo | 0.1325 | 16.1375 | 1013 | 202 |
| Oniénguélé | city | Region de la Cuvette | Congo | -0.115 | 15.5605556 | 1099 | 336 |
| Oniénguélé | city | Region de la Cuvette | Congo | -0.0986111 | 15.5636111 | 1095 | 336 |
| Onkala | city | Region des Plateaux | Congo | -2.3236111 | 14.5408333 | 2312 | 476 |
| Onkasa | city | Region de la Lekoumou | Congo | -2.805 | 13.7091667 | 1942 | 388 |
| Onkasa II | city | Region de la Lekoumou | Congo | -2.8013889 | 13.6830556 | 1991 | 377 |
| Onkassa | city | Region de la Lekoumou | Congo | -2.805 | 13.7091667 | 1942 | 388 |
| Onkassa II | city | Region de la Lekoumou | Congo | -2.8013889 | 13.6830556 | 1991 | 377 |
| Onkey | city | Region des Plateaux | Congo | -2.1552778 | 15.8663889 | 1499 | 635 |
| Onkiele | city | Region des Plateaux | Congo | -2.6691667 | 15.305 | 2004 | 182 |
| Onkiélé | city | Region des Plateaux | Congo | -2.6691667 | 15.305 | 2004 | 182 |
| Onkonoso | city | Region des Plateaux | Congo | -1.5052778 | 15.9105556 | 1223 | 618 |
| Onkonosso | city | Region des Plateaux | Congo | -1.5052778 | 15.9105556 | 1223 | 618 |
| Onkouma | city | Region de la Lekoumou | Congo | -2.9161111 | 13.8955556 | 2001 | 406 |
| Onna | city | Region des Plateaux | Congo | -1.7244444 | 16.1044444 | 1043 | 635 |
| Onnzelo | city | Region de la Cuvette | Congo | -0.9125 | 16.2258333 | 1030 | 419 |
| Onnzélo | city | Region de la Cuvette | Congo | -0.9125 | 16.2258333 | 1030 | 419 |
| Onoabi | city | Region des Plateaux | Congo | -2.2463889 | 16.0488889 | 997 | 635 |
| Onouengue | city | Region de la Cuvette | Congo | -0.8252778 | 15.8366667 | 1259 | 420 |
| Onouèngué | city | Region de la Cuvette | Congo | -0.8252778 | 15.8366667 | 1259 | 420 |
| Onpouana | city | Region des Plateaux | Congo | -1.8147222 | 16.0875 | 1030 | 635 |
| Onsi | city | Region des Plateaux | Congo | -1.765 | 16.0497222 | 1085 | 635 |
| Ontabi | city | Region des Plateaux | Congo | -2.4280556 | 16.1336111 | 941 | 965 |
| Ontchouandjoko | city | Region de la Cuvette | Congo | 0.0722222 | 14.2336111 | 1909 | 322 |
| Ontchouo | city | Region de la Lekoumou | Congo | -2.6666667 | 13.3833333 | 1994 | 423 |
| Ontchouo | city | Region des Plateaux | Congo | -2.6636111 | 15.3663889 | 2007 | 182 |
| Ontchouomo | city | Region de la Cuvette | Congo | -0.1175 | 14.5358333 | 1692 | 322 |
| Onto | city | Region des Plateaux | Congo | -2.5466667 | 15.0877778 | 2024 | 182 |
| Ontogo | city | Region de la Cuvette | Congo | -0.6183333 | 15.0616667 | 1473 | 491 |
| Ontolo | city | Region de la Cuvette | Congo | -1.4386111 | 15.0744444 | 1459 | 297 |
| Ontourou | city | Region des Plateaux | Congo | -2.3027778 | 14.3725 | 1906 | 476 |
| Ontsay | city | Region de la Lekoumou | Congo | -2.8847222 | 13.6055556 | 1994 | 417 |
| Ontsiaye | city | Region de la Lekoumou | Congo | -2.8847222 | 13.6055556 | 1994 | 417 |
| Onzala | city | Region des Plateaux | Congo | -1.5152778 | 15.3927778 | 1669 | 509 |
| Onzele | city | Region des Plateaux | Congo | -1.6783333 | 16.1141667 | 1040 | 635 |
| Onzele | city | Region des Plateaux | Congo | -2.0691667 | 16.1333333 | 1053 | 635 |
| Onzéle | city | Region des Plateaux | Congo | -2.0691667 | 16.1333333 | 1053 | 635 |
| Onzélé | city | Region des Plateaux | Congo | -1.6783333 | 16.1141667 | 1040 | 635 |
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