| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obaix | city | Wallonie | Belgium | 50.53 | 4.36 | 830 | 20953 |
| Obelisque | city | Wallonie | Belgium | 50.38 | 5.28 | 885 | 3238 |
| Oben Steine Brück | city | Wallonie | Belgium | 49.72 | 5.70 | 1243 | 6325 |
| Obent Steine Brück | city | Wallonie | Belgium | 49.72 | 5.70 | 1243 | 6325 |
| Ober-Elter | city | Wallonie | Belgium | 49.65 | 5.84 | 1102 | 18203 |
| Ober-Emmels | city | Wallonie | Belgium | 50.30 | 6.09 | 1709 | 6615 |
| Oberhausen | city | Wallonie | Belgium | 50.16 | 6.14 | 1669 | 5758 |
| Oberst-Crombach | city | Wallonie | Belgium | 50.28 | 6.04 | 1709 | 2763 |
| Oberstenbusch | city | Wallonie | Belgium | 50.68 | 5.98 | 830 | 24181 |
| Obigies | city | Wallonie | Belgium | 50.66 | 3.36 | 160 | 21888 |
| Oborne | city | Wallonie | Belgium | 50.76 | 5.54 | 393 | 32594 |
| Obourg | city | Wallonie | Belgium | 50.47 | 4.01 | 154 | 50270 |
| Ochain | city | Wallonie | Belgium | 50.43 | 5.36 | 905 | 5871 |
| Ochamps | city | Wallonie | Belgium | 49.92 | 5.28 | 1669 | 2398 |
| Ocquier | city | Wallonie | Belgium | 50.40 | 5.39 | 830 | 4968 |
| Ocquiere | city | Wallonie | Belgium | 50.67 | 4.68 | 393 | 22817 |
| Odeghien | city | Wallonie | Belgium | 50.70 | 4.33 | 262 | 57378 |
| Odeigne | city | Wallonie | Belgium | 50.26 | 5.69 | 1968 | 1521 |
| Odet | city | Wallonie | Belgium | 50.39 | 5.31 | 964 | 2057 |
| Odeur | city | Wallonie | Belgium | 50.71 | 5.42 | 830 | 15236 |
| Odomont | city | Wallonie | Belgium | 50.53 | 4.40 | 830 | 17609 |
| Odoumont | city | Wallonie | Belgium | 50.53 | 4.40 | 830 | 17609 |
| Odrimont | city | Wallonie | Belgium | 50.31 | 5.81 | 1669 | 2822 |
| Odrimont | city | Wallonie | Belgium | 50.70 | 4.48 | 206 | 41941 |
| Oe | city | Wallonie | Belgium | 50.62 | 6.03 | 997 | 17819 |
| Oerle | city | Wallonie | Belgium | 50.73 | 5.37 | 337 | 11426 |
| Oeudeghien | city | Wallonie | Belgium | 50.68 | 3.71 | 223 | 6896 |
| Offagne | city | Wallonie | Belgium | 49.89 | 5.17 | 1669 | 2891 |
| Offaing | city | Wallonie | Belgium | 49.84 | 5.48 | 1669 | 5956 |
| Offange | city | Wallonie | Belgium | 49.89 | 5.17 | 1669 | 2891 |
| Offignies | city | Wallonie | Belgium | 50.38 | 3.80 | 830 | 46550 |
| Offus | city | Wallonie | Belgium | 50.65 | 4.91 | 830 | 10990 |
| Ogn'e | city | Wallonie | Belgium | 50.52 | 5.66 | 882 | 20354 |
| Ognée | city | Wallonie | Belgium | 50.52 | 5.66 | 882 | 20354 |
| Ogn’e | city | Wallonie | Belgium | 50.52 | 5.66 | 882 | 20354 |
| Ogy | city | Wallonie | Belgium | 50.72 | 3.78 | 150 | 14437 |
| Oha | city | Wallonie | Belgium | 50.53 | 5.19 | 830 | 21554 |
| Ohain | city | Wallonie | Belgium | 50.70 | 4.47 | 278 | 42455 |
| Ohey | city | Wallonie | Belgium | 50.44 | 5.12 | 839 | 9366 |
| Ohey (Goesnes) | city | Wallonie | Belgium | 50.44 | 5.22 | 830 | 4802 |
| Ohey (Haillot) | city | Wallonie | Belgium | 50.44 | 5.15 | 879 | 7192 |
| Oignies | city | Wallonie | Belgium | 50.43 | 4.60 | 830 | 53391 |
| Oignies | city | Wallonie | Belgium | 50.02 | 4.64 | 1000 | 4348 |
| Oisefagne | city | Wallonie | Belgium | 49.87 | 5.65 | 1669 | 1852 |
| Oisquercq | city | Wallonie | Belgium | 50.67 | 4.22 | 262 | 47931 |
| Oizy | city | Wallonie | Belgium | 49.89 | 5.01 | 1669 | 3274 |
| Oleye | city | Wallonie | Belgium | 50.71 | 5.28 | 360 | 23817 |
| Ollignies | city | Wallonie | Belgium | 50.69 | 3.86 | 108 | 18744 |
| Ollomont | city | Wallonie | Belgium | 50.16 | 5.68 | 1669 | 442 |
| Olloy | city | Wallonie | Belgium | 50.07 | 4.61 | 830 | 3221 |
| Olloy-sur-Viroin | city | Wallonie | Belgium | 50.07 | 4.61 | 830 | 3221 |
| Olne | city | Wallonie | Belgium | 50.59 | 5.75 | 830 | 28334 |
| Omal | city | Wallonie | Belgium | 50.65 | 5.19 | 830 | 10271 |
| Ombret-Rausa | city | Wallonie | Belgium | 50.54 | 5.34 | 830 | 22954 |
| Ombret-Rawsa | city | Wallonie | Belgium | 50.54 | 5.34 | 830 | 22954 |
| Ombreucq | city | Wallonie | Belgium | 50.74 | 3.79 | 124 | 17275 |
| Omezee | city | Wallonie | Belgium | 50.19 | 4.70 | 830 | 2743 |
| On | city | Wallonie | Belgium | 50.17 | 5.29 | 984 | 8926 |
| Once | city | Wallonie | Belgium | 50.77 | 5.58 | 387 | 23017 |
| Ondenval | city | Wallonie | Belgium | 50.39 | 6.12 | 1669 | 6163 |
| Oneux | city | Wallonie | Belgium | 50.60 | 5.46 | 226 | 63839 |
| Oneux | city | Wallonie | Belgium | 50.55 | 5.83 | 984 | 39955 |
| Oneux | city | Wallonie | Belgium | 50.47 | 5.60 | 853 | 10422 |
| Oneux | city | Wallonie | Belgium | 50.39 | 5.43 | 984 | 5117 |
| Onhaye | city | Wallonie | Belgium | 50.24 | 4.84 | 830 | 6487 |
| Onhaye (Anthée) | city | Wallonie | Belgium | 50.24 | 4.76 | 830 | 4036 |
| Onhaye (Falaën) | city | Wallonie | Belgium | 50.28 | 4.79 | 830 | 3121 |
| Onhaye (Gerin) | city | Wallonie | Belgium | 50.25 | 4.82 | 830 | 6584 |
| Onhaye (Sommière) | city | Wallonie | Belgium | 50.28 | 4.85 | 830 | 10486 |
| Onhaye (Weillen) | city | Wallonie | Belgium | 50.26 | 4.82 | 830 | 6354 |
| Onnezies | city | Wallonie | Belgium | 50.36 | 3.72 | 298 | 11652 |
| Onoz | city | Wallonie | Belgium | 50.49 | 4.67 | 830 | 26371 |
| Onthaines | city | Wallonie | Belgium | 50.29 | 5.03 | 875 | 3734 |
| Oostkerk | city | Wallonie | Belgium | 50.67 | 4.22 | 262 | 47931 |
| Opgeldenaken | city | Wallonie | Belgium | 50.71 | 4.84 | 328 | 9966 |
| Ophain | city | Wallonie | Belgium | 50.67 | 4.35 | 403 | 47465 |
| Ophain | city | Wallonie | Belgium | 50.69 | 4.19 | 144 | 49270 |
| Ophain-Bois-Seigneur-Isaac | city | Wallonie | Belgium | 50.67 | 4.35 | 403 | 47465 |
| Opheylissem | city | Wallonie | Belgium | 50.74 | 4.98 | 219 | 12603 |
| Opont | city | Wallonie | Belgium | 49.93 | 5.12 | 1158 | 2631 |
| Oppagne | city | Wallonie | Belgium | 50.31 | 5.51 | 1010 | 4964 |
| Opprebais | city | Wallonie | Belgium | 50.68 | 4.80 | 400 | 6678 |
| Opzullik | city | Wallonie | Belgium | 50.65 | 3.92 | 269 | 7204 |
| Orbais | city | Wallonie | Belgium | 50.64 | 4.77 | 830 | 5275 |
| Orchies | city | Wallonie | Belgium | 50.65 | 3.25 | 98 | 83670 |
| Orchimont | city | Wallonie | Belgium | 49.89 | 4.93 | 964 | 2970 |
| Orcq | city | Wallonie | Belgium | 50.60 | 3.35 | 180 | 30311 |
| Orcîmont | city | Wallonie | Belgium | 49.89 | 4.93 | 964 | 2970 |
| Ordin | city | Wallonie | Belgium | 50.47 | 4.71 | 393 | 30866 |
| Oret | city | Wallonie | Belgium | 50.30 | 4.62 | 830 | 10061 |
| Oreye | city | Wallonie | Belgium | 50.73 | 5.37 | 337 | 11426 |
| Oreye (Bergilers) | city | Wallonie | Belgium | 50.71 | 5.33 | 374 | 18195 |
| Oreye (Grandville) | city | Wallonie | Belgium | 50.73 | 5.35 | 374 | 13582 |
| Oreye (Lens-sur-Geer) | city | Wallonie | Belgium | 50.72 | 5.35 | 374 | 14088 |
| Oreye (Otrange) | city | Wallonie | Belgium | 50.74 | 5.39 | 337 | 9888 |
| Orgeo | city | Wallonie | Belgium | 49.83 | 5.31 | 1236 | 4907 |
| Orival | city | Wallonie | Belgium | 50.62 | 4.30 | 830 | 30095 |
| Ormeignies | city | Wallonie | Belgium | 50.60 | 3.75 | 213 | 19880 |
| Ormont | city | Wallonie | Belgium | 50.64 | 3.37 | 62 | 28764 |
| Orolaunum | city | Wallonie | Belgium | 49.68 | 5.82 | 1669 | 19037 |
| Orp-Jauche (Jandrain-Jandrenouille) | city | Wallonie | Belgium | 50.67 | 4.98 | 370 | 10175 |
| Orp-Jauche (Noduwez) | city | Wallonie | Belgium | 50.73 | 4.97 | 282 | 12310 |
| Orp-Jauche (Énines) | city | Wallonie | Belgium | 50.69 | 4.93 | 364 | 12648 |
| Orp-le-Grand | city | Wallonie | Belgium | 50.70 | 4.99 | 331 | 11570 |
| Orp-le-Petit | city | Wallonie | Belgium | 50.70 | 4.99 | 308 | 10899 |
| Orroir | city | Wallonie | Belgium | 50.75 | 3.48 | 78 | 19350 |
| Orsainfaing | city | Wallonie | Belgium | 49.72 | 5.52 | 1105 | 3791 |
| Ortheuville | city | Wallonie | Belgium | 50.08 | 5.54 | 1181 | 3142 |
| Ortho | city | Wallonie | Belgium | 50.12 | 5.61 | 1669 | 342 |
| Osage | city | Wallonie | Belgium | 50.60 | 4.42 | 830 | 17064 |
| Ossogne | city | Wallonie | Belgium | 50.41 | 5.22 | 846 | 4133 |
| Ossogne | city | Wallonie | Belgium | 50.29 | 4.34 | 830 | 2964 |
| Ostemeree | city | Wallonie | Belgium | 50.25 | 4.77 | 830 | 4265 |
| Oster | city | Wallonie | Belgium | 50.31 | 5.56 | 905 | 2988 |
| Oster | city | Wallonie | Belgium | 50.27 | 5.66 | 1778 | 2067 |
| Ostiches | city | Wallonie | Belgium | 50.68 | 3.76 | 144 | 15022 |
| Otaimont | city | Wallonie | Belgium | 50.42 | 6.02 | 1669 | 10843 |
| Oteppe | city | Wallonie | Belgium | 50.58 | 5.13 | 830 | 10585 |
| Othée | city | Wallonie | Belgium | 50.71 | 5.47 | 830 | 35135 |
| Otrange | city | Wallonie | Belgium | 50.74 | 5.39 | 337 | 9888 |
| Otreppe | city | Wallonie | Belgium | 50.56 | 5.03 | 830 | 10788 |
| Ottignies | city | Wallonie | Belgium | 50.67 | 4.56 | 196 | 54175 |
| Ottignies-Louvain-la-Neuve (Céroux-Mousty) | city | Wallonie | Belgium | 50.66 | 4.51 | 383 | 34066 |
| Ottignies-Louvain-la-Neuve (Limelette) | city | Wallonie | Belgium | 50.68 | 4.57 | 328 | 62341 |
| Ottignies-Louvain-la-Neuve (Louvain-la-Neuve) | city | Wallonie | Belgium | 50.67 | 4.61 | 830 | 46135 |
| Ottignies-Louvain-la-Neuve (Ottignies) | city | Wallonie | Belgium | 50.67 | 4.56 | 196 | 54175 |
| Ottré | city | Wallonie | Belgium | 50.25 | 5.84 | 1781 | 1775 |
| Oubourcy | city | Wallonie | Belgium | 50.04 | 5.80 | 1669 | 4115 |
| Oudler | city | Wallonie | Belgium | 50.20 | 6.09 | 1669 | 4617 |
| Oudoumont | city | Wallonie | Belgium | 50.62 | 5.33 | 830 | 17675 |
| Oufalijhe | city | Wallonie | Belgium | 50.13 | 5.79 | 1230 | 4851 |
| Oufet | city | Wallonie | Belgium | 50.44 | 5.47 | 921 | 4720 |
| Ouffet | city | Wallonie | Belgium | 50.44 | 5.47 | 921 | 4720 |
| Oufny | city | Wallonie | Belgium | 50.37 | 5.72 | 961 | 5735 |
| Ougree | city | Wallonie | Belgium | 50.60 | 5.54 | 830 | 160728 |
| Ouhar | city | Wallonie | Belgium | 50.49 | 5.54 | 830 | 14239 |
| Ouldoumont | city | Wallonie | Belgium | 50.62 | 5.33 | 830 | 17675 |
| Ounes | city | Wallonie | Belgium | 50.33 | 5.13 | 912 | 17826 |
| Oupeye | city | Wallonie | Belgium | 50.71 | 5.64 | 295 | 71452 |
| Oupeye (Haccourt) | city | Wallonie | Belgium | 50.73 | 5.67 | 180 | 49898 |
| Oupeye (Heure-le-Romain) | city | Wallonie | Belgium | 50.73 | 5.63 | 305 | 51572 |
| Oupeye (Houtain-Saint-Siméon) | city | Wallonie | Belgium | 50.74 | 5.61 | 830 | 41271 |
| Oupeye (Vivegnis) | city | Wallonie | Belgium | 50.70 | 5.65 | 187 | 83091 |
| Our | city | Wallonie | Belgium | 49.96 | 5.12 | 1246 | 2438 |
| Ouren | city | Wallonie | Belgium | 50.14 | 6.13 | 1669 | 3527 |
| Ourt | city | Wallonie | Belgium | 49.92 | 5.42 | 1669 | 5480 |
| Ourthe | city | Wallonie | Belgium | 50.19 | 5.98 | 1669 | 5425 |
| Outre Dendre | city | Wallonie | Belgium | 50.67 | 3.80 | 98 | 21562 |
| Outre Meuse | city | Wallonie | Belgium | 50.64 | 5.58 | 269 | 189517 |
| Outre l'Eau | city | Wallonie | Belgium | 50.67 | 3.67 | 367 | 7886 |
| Outre l'Eau | city | Wallonie | Belgium | 50.52 | 3.60 | 121 | 29470 |
| Outre l’Eau | city | Wallonie | Belgium | 50.67 | 3.67 | 367 | 7886 |
| Outre l’Eau | city | Wallonie | Belgium | 50.52 | 3.60 | 121 | 29470 |
| Outrelouxhe | city | Wallonie | Belgium | 50.50 | 5.33 | 830 | 13087 |
| Outrewarche | city | Wallonie | Belgium | 50.45 | 6.14 | 1738 | 7307 |
| Overoet | city | Wallonie | Belgium | 50.63 | 6.00 | 925 | 15927 |
| Overoth | city | Wallonie | Belgium | 50.63 | 6.00 | 925 | 15927 |
| Overstehindel | city | Wallonie | Belgium | 50.73 | 5.92 | 830 | 12825 |
| Ovifat | city | Wallonie | Belgium | 50.47 | 6.11 | 1771 | 5976 |
| Ozo | city | Wallonie | Belgium | 50.37 | 5.55 | 830 | 4247 |