UpAlphabetical listing of Places in Congo
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Onan | city | Plateaux | Congo | -1.72 | 16.10 | 1043 | 298 |
| Onanga | city | Cuvette | Congo | 0.06 | 15.56 | 1102 | 149 |
| Onanga | city | Cuvette | Congo | 0.00 | 16.36 | 997 | 60 |
| Onchouondjoko | city | Cuvette-Ouest | Congo | 0.07 | 14.23 | 1909 | 447 |
| Ondaba | city | Plateaux | Congo | -1.83 | 15.82 | 1204 | 13586 |
| Ondaka | city | Cuvette | Congo | -0.46 | 15.82 | 1095 | 63 |
| Ondama | city | Lekoumou | Congo | -2.95 | 13.87 | 1998 | 447 |
| Ondama | city | Lekoumou | Congo | -2.83 | 13.85 | 1847 | 447 |
| Ondama I | city | Lekoumou | Congo | -2.83 | 13.85 | 1847 | 447 |
| Ondingi | city | Cuvette | Congo | -1.13 | 15.18 | 1669 | 638 |
| Ondjouba | city | Cuvette-Ouest | Congo | 0.38 | 14.79 | 1669 | 0 |
| Ondongo | city | Cuvette | Congo | -0.22 | 15.74 | 1135 | 126 |
| Ondouna | city | Cuvette-Ouest | Congo | -0.96 | 14.85 | 1751 | 447 |
| Ondza | city | Cuvette | Congo | -0.02 | 15.69 | 1072 | 6214 |
| Ondzala | city | Plateaux | Congo | -1.80 | 16.15 | 1007 | 298 |
| Ondzatounou | city | Plateaux | Congo | -1.55 | 16.01 | 1141 | 298 |
| Ondzela | city | Plateaux | Congo | -1.80 | 16.13 | 1020 | 298 |
| Ondzeli | city | Plateaux | Congo | -1.68 | 16.11 | 1040 | 298 |
| Ondzio | city | Plateaux | Congo | -1.54 | 15.89 | 1249 | 299 |
| Onfounou | city | Plateaux | Congo | -1.57 | 15.62 | 1669 | 522 |
| Ongali | city | Cuvette | Congo | -1.59 | 14.79 | 1745 | 279 |
| Ongali | city | Plateaux | Congo | -1.50 | 15.80 | 1669 | 428 |
| Ongali | city | Plateaux | Congo | -1.79 | 16.08 | 1040 | 298 |
| Ongali | city | Plateaux | Congo | -2.30 | 14.50 | 2595 | 596 |
| Ongali | city | Cuvette | Congo | -1.47 | 14.74 | 1948 | 298 |
| Ongali | city | Plateaux | Congo | -1.51 | 15.96 | 1190 | 331 |
| Onganaka | city | Cuvette | Congo | 0.08 | 15.97 | 1040 | 149 |
| Ongende | city | Plateaux | Congo | -1.21 | 15.63 | 1669 | 596 |
| Ongia | city | Cuvette-Ouest | Congo | -1.06 | 14.69 | 1935 | 441 |
| Ongia | city | Plateaux | Congo | -2.42 | 14.96 | 2011 | 149 |
| Ongo | city | Plateaux | Congo | -1.61 | 16.05 | 1095 | 298 |
| Ongo III | city | Plateaux | Congo | -1.62 | 16.05 | 1095 | 298 |
| Ongomo | city | Cuvette | Congo | -0.10 | 15.67 | 1095 | 149 |
| Ongomon | city | Cuvette | Congo | -0.10 | 15.67 | 1095 | 149 |
| Ongondza I | city | Cuvette | Congo | -0.96 | 15.32 | 1843 | 745 |
| Ongondza II | city | Cuvette | Congo | -0.97 | 15.32 | 1847 | 745 |
| Ongonyi | city | Plateaux | Congo | -1.59 | 16.01 | 1135 | 298 |
| Ongouala | city | Plateaux | Congo | -1.59 | 15.95 | 1233 | 298 |
| Ongouba | city | Cuvette | Congo | -0.47 | 15.20 | 1669 | 652 |
| Ongouli | city | Plateaux | Congo | -1.18 | 15.44 | 1669 | 596 |
| Ongouli | city | Plateaux | Congo | -1.21 | 15.90 | 1082 | 596 |
| Ongouli | city | Plateaux | Congo | -1.17 | 15.44 | 1669 | 596 |
| Ongounda | city | Cuvette-Ouest | Congo | 0.13 | 14.17 | 1850 | 447 |
| Ongoundja | city | Cuvette | Congo | -0.96 | 15.32 | 1843 | 745 |
| Ongouobéla | city | Cuvette | Congo | -1.40 | 14.87 | 1866 | 298 |
| Ongouoni | city | Plateaux | Congo | -1.59 | 16.01 | 1135 | 298 |
| Ongouémé | city | Cuvette | Congo | -0.96 | 15.76 | 1197 | 50 |
| Ongoy | city | Plateaux | Congo | -1.61 | 16.02 | 1125 | 298 |
| Ongoye | city | Plateaux | Congo | -1.61 | 16.02 | 1125 | 298 |
| Ongoye | city | Plateaux | Congo | -1.60 | 15.55 | 1669 | 596 |
| Onguende | city | Plateaux | Congo | -1.21 | 15.63 | 1669 | 596 |
| Onguia | city | Cuvette-Ouest | Congo | -1.06 | 14.69 | 1935 | 441 |
| Onguia | city | Cuvette-Ouest | Congo | -1.02 | 14.87 | 1761 | 447 |
| Onguia | city | Plateaux | Congo | -2.42 | 14.96 | 2011 | 149 |
| Onguia | city | Cuvette | Congo | -1.36 | 15.06 | 1669 | 298 |
| Onguia-Endeli | city | Cuvette-Ouest | Congo | -1.02 | 14.87 | 1761 | 447 |
| Onguida | city | Cuvette | Congo | -0.61 | 15.74 | 1669 | 0 |
| Onguido | city | Cuvette | Congo | -0.61 | 15.74 | 1669 | 0 |
| Onguinda | city | Cuvette | Congo | -0.61 | 15.74 | 1669 | 0 |
| Ongwala | city | Plateaux | Congo | -1.59 | 15.95 | 1233 | 298 |
| Ongéne | city | Brazzaville | Congo | -3.62 | 15.23 | 2024 | 3626 |
| Onia | city | Cuvette | Congo | -0.01 | 15.78 | 1062 | 149 |
| Onianva | city | Plateaux | Congo | -2.35 | 15.81 | 1669 | 198 |
| Onienga | city | Cuvette-Ouest | Congo | -0.07 | 13.98 | 2509 | 431 |
| Onienguele | city | Cuvette | Congo | -0.10 | 15.56 | 1095 | 149 |
| Oningui | city | Cuvette | Congo | -1.13 | 15.18 | 1669 | 638 |
| Oniombe | city | Sangha | Congo | 0.13 | 16.14 | 1013 | 89 |
| Onionbe | city | Sangha | Congo | 0.13 | 16.14 | 1013 | 89 |
| Oniénguélé | city | Cuvette | Congo | -0.12 | 15.56 | 1099 | 149 |
| Onkala | city | Plateaux | Congo | -2.32 | 14.54 | 2509 | 596 |
| Onkasa | city | Lekoumou | Congo | -2.81 | 13.71 | 1942 | 423 |
| Onkasa II | city | Lekoumou | Congo | -2.80 | 13.68 | 1991 | 421 |
| Onkassa | city | Lekoumou | Congo | -2.81 | 13.71 | 1942 | 423 |
| Onkassa II | city | Lekoumou | Congo | -2.80 | 13.68 | 1991 | 421 |
| Onkey | city | Plateaux | Congo | -2.16 | 15.87 | 1669 | 298 |
| Onkiélé | city | Plateaux | Congo | -2.67 | 15.30 | 2004 | 149 |
| Onkonoso | city | Plateaux | Congo | -1.51 | 15.91 | 1223 | 357 |
| Onkonosso | city | Plateaux | Congo | -1.51 | 15.91 | 1223 | 357 |
| Onkouma | city | Lekoumou | Congo | -2.92 | 13.90 | 2001 | 447 |
| Onna | city | Plateaux | Congo | -1.72 | 16.10 | 1043 | 298 |
| Onnzelo | city | Cuvette | Congo | -0.91 | 16.23 | 1030 | 0 |
| Onoabi | city | Plateaux | Congo | -2.25 | 16.05 | 997 | 298 |
| Onouengue | city | Cuvette | Congo | -0.83 | 15.84 | 1669 | 0 |
| Onpouana | city | Plateaux | Congo | -1.81 | 16.09 | 1030 | 298 |
| Onsi | city | Plateaux | Congo | -1.77 | 16.05 | 1085 | 298 |
| Ontabi | city | Plateaux | Congo | -2.43 | 16.13 | 941 | 342 |
| Ontchouandjoko | city | Cuvette-Ouest | Congo | 0.07 | 14.23 | 1909 | 447 |
| Ontchouo | city | Lekoumou | Congo | -2.67 | 13.38 | 1994 | 447 |
| Ontchouo | city | Plateaux | Congo | -2.66 | 15.37 | 2007 | 149 |
| Ontchouomo | city | Cuvette-Ouest | Congo | -0.12 | 14.54 | 1692 | 447 |
| Onto | city | Plateaux | Congo | -2.55 | 15.09 | 2024 | 149 |
| Ontogo | city | | Congo | -0.62 | 15.06 | 1669 | 589 |
| Ontolo | city | Cuvette | Congo | -1.44 | 15.07 | 1669 | 390 |
| Ontourou | city | Plateaux | Congo | -2.30 | 14.37 | 1906 | 596 |
| Ontsay | city | Lekoumou | Congo | -2.88 | 13.61 | 1994 | 447 |
| Ontsiaye | city | Lekoumou | Congo | -2.88 | 13.61 | 1994 | 447 |
| Onzala | city | Plateaux | Congo | -1.52 | 15.39 | 1669 | 596 |
| Onzéle | city | Plateaux | Congo | -2.07 | 16.13 | 1053 | 298 |
| Onzélé | city | Plateaux | Congo | -1.68 | 16.11 | 1040 | 298 |
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