| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oubourcy | city | Wallonie | Belgium | 50.04 | 5.80 | 1669 | 4115 |
| Ouckene | city | Vlaanderen | Belgium | 50.92 | 3.16 | 75 | 64428 |
| Oud Bavegem | city | Vlaanderen | Belgium | 50.95 | 3.85 | 82 | 39499 |
| Oud Kerkhof | city | Vlaanderen | Belgium | 50.95 | 5.30 | 98 | 54360 |
| Oud Lillo | city | Vlaanderen | Belgium | 51.32 | 4.28 | 19 | 103953 |
| Oud Moregen | city | Vlaanderen | Belgium | 50.85 | 3.47 | 114 | 28260 |
| Oud Smetlede | city | Vlaanderen | Belgium | 50.97 | 3.92 | 75 | 42067 |
| Oud Stuivekenskerke | city | Vlaanderen | Belgium | 51.06 | 2.83 | 6 | 11770 |
| Oud Stuyvekens | city | Vlaanderen | Belgium | 51.06 | 2.83 | 6 | 11770 |
| Oud Stuyvekenskerke | city | Vlaanderen | Belgium | 51.06 | 2.83 | 6 | 11770 |
| Oud Termien | city | Vlaanderen | Belgium | 50.95 | 5.47 | 190 | 51163 |
| Oud Waterschei | city | Vlaanderen | Belgium | 50.99 | 5.53 | 269 | 48130 |
| Oud Winterslag | city | Vlaanderen | Belgium | 50.99 | 5.50 | 265 | 54030 |
| Oud-Heverlee | city | Vlaanderen | Belgium | 50.84 | 4.66 | 200 | 49292 |
| Oud-Heverlee (Blanden) | city | Vlaanderen | Belgium | 50.82 | 4.71 | 229 | 45472 |
| Oud-Heverlee (Haasrode) | city | Vlaanderen | Belgium | 50.83 | 4.73 | 242 | 50255 |
| Oud-Heverlee (Vaalbeek) | city | Vlaanderen | Belgium | 50.83 | 4.70 | 219 | 55782 |
| Oud-Kruis-schans | city | Vlaanderen | Belgium | 51.30 | 4.33 | 16 | 141613 |
| Oud-Turnhout | city | Vlaanderen | Belgium | 51.32 | 4.99 | 72 | 44787 |
| Oudank | city | Vlaanderen | Belgium | 51.07 | 3.24 | 72 | 14933 |
| Oude Baan | city | Vlaanderen | Belgium | 51.25 | 4.60 | 26 | 38599 |
| Oude Baan | city | Vlaanderen | Belgium | 50.87 | 4.63 | 134 | 46466 |
| Oude Baan | city | Vlaanderen | Belgium | 50.87 | 4.50 | 196 | 82801 |
| Oude Barreel | city | Vlaanderen | Belgium | 51.25 | 4.45 | 9 | 141171 |
| Oude Brug | city | Vlaanderen | Belgium | 51.10 | 4.00 | 9 | 47135 |
| Oude Doel | city | Vlaanderen | Belgium | 51.33 | 4.24 | 3 | 56056 |
| Oude God | city | Vlaanderen | Belgium | 51.17 | 4.45 | 42 | 154592 |
| Oude Hei | city | Vlaanderen | Belgium | 51.08 | 5.75 | 98 | 28283 |
| Oude Hoeve | city | Vlaanderen | Belgium | 50.98 | 4.88 | 59 | 29907 |
| Oude Hulst | city | Vlaanderen | Belgium | 50.87 | 3.67 | 144 | 24345 |
| Oude Kruisschans | city | Vlaanderen | Belgium | 51.30 | 4.33 | 16 | 141613 |
| Oude Molen | city | Vlaanderen | Belgium | 50.92 | 5.05 | 114 | 17453 |
| Oude Pastorij | city | Vlaanderen | Belgium | 50.97 | 5.08 | 65 | 27056 |
| Oude Plaats | city | Vlaanderen | Belgium | 50.78 | 4.08 | 219 | 18563 |
| Oude Steenhoven | city | Vlaanderen | Belgium | 51.05 | 4.65 | 39 | 38166 |
| Oude Waan | city | Vlaanderen | Belgium | 50.93 | 5.00 | 219 | 22386 |
| Oude-Russelbeken | city | Vlaanderen | Belgium | 50.92 | 5.40 | 141 | 43935 |
| Oudebaan | city | Vlaanderen | Belgium | 51.02 | 4.07 | 9 | 57422 |
| Oudeburg | city | Vlaanderen | Belgium | 51.18 | 3.00 | 9 | 41056 |
| Oudecappelle | city | Vlaanderen | Belgium | 51.01 | 2.81 | 9 | 7503 |
| Oudegem | city | Vlaanderen | Belgium | 51.01 | 4.06 | 9 | 58470 |
| Oudegracht | city | Vlaanderen | Belgium | 51.32 | 4.47 | 32 | 50956 |
| Oudehoef | city | Vlaanderen | Belgium | 50.98 | 4.88 | 59 | 29907 |
| Oudehof | city | Vlaanderen | Belgium | 51.10 | 3.83 | 9 | 55644 |
| Oudekapelle | city | Vlaanderen | Belgium | 51.01 | 2.81 | 9 | 7503 |
| Ouden Bos | city | Vlaanderen | Belgium | 50.96 | 4.91 | 167 | 27695 |
| Ouden Briel | city | Vlaanderen | Belgium | 51.04 | 4.19 | 16 | 44578 |
| Ouden Doel | city | Vlaanderen | Belgium | 51.33 | 4.24 | 3 | 56056 |
| Ouden Sprinkhaan | city | Vlaanderen | Belgium | 51.20 | 4.47 | 22 | 147888 |
| Ouden Waen | city | Vlaanderen | Belgium | 50.93 | 5.00 | 219 | 22386 |
| Ouden Wippendries | city | Vlaanderen | Belgium | 50.97 | 4.50 | 32 | 54471 |
| Oudenaarde | city | Vlaanderen | Belgium | 50.85 | 3.61 | 45 | 30704 |
| Oudenaken | city | Vlaanderen | Belgium | 50.78 | 4.20 | 98 | 37007 |
| Oudenberg | city | Vlaanderen | Belgium | 50.77 | 3.89 | 154 | 35780 |
| Oudenbos | city | Vlaanderen | Belgium | 51.09 | 3.91 | 9 | 28032 |
| Oudenbosch | city | Vlaanderen | Belgium | 50.96 | 4.91 | 167 | 27695 |
| Oudenburg | city | Vlaanderen | Belgium | 51.18 | 3.00 | 9 | 41056 |
| Oudenburgschesluis | city | Vlaanderen | Belgium | 51.21 | 3.86 | 6 | 24201 |
| Oudenburgsesluis | city | Vlaanderen | Belgium | 51.21 | 3.86 | 6 | 24201 |
| Oudendijk | city | Vlaanderen | Belgium | 51.35 | 4.30 | 13 | 113244 |
| Oudendijk | city | Vlaanderen | Belgium | 51.28 | 4.28 | 3 | 71115 |
| Oudendyk | city | Vlaanderen | Belgium | 51.35 | 4.30 | 13 | 113244 |
| Oudendyk | city | Vlaanderen | Belgium | 51.28 | 4.28 | 3 | 71115 |
| Oudenhoek | city | Vlaanderen | Belgium | 50.96 | 3.85 | 59 | 41853 |
| Oudenhove | city | Vlaanderen | Belgium | 50.77 | 3.67 | 393 | 20364 |
| Oudenkerkenhoek | city | Vlaanderen | Belgium | 50.80 | 3.83 | 114 | 23990 |
| Oudenmolen | city | Vlaanderen | Belgium | 51.10 | 3.47 | 26 | 25288 |
| Oudenmolen | city | Vlaanderen | Belgium | 51.07 | 4.63 | 59 | 39032 |
| Oudenoarde | city | Vlaanderen | Belgium | 50.85 | 3.61 | 45 | 30704 |
| Oudenoel | city | Vlaanderen | Belgium | 51.33 | 4.24 | 3 | 56056 |
| Oudenstok | city | Vlaanderen | Belgium | 51.01 | 4.91 | 52 | 22133 |
| Ouderdom | city | Vlaanderen | Belgium | 50.82 | 2.78 | 95 | 12042 |
| Oudergem | city | Bruxelles-Capitale | Belgium | 50.82 | 4.43 | 232 | 336704 |
| Ouderseel | city | Vlaanderen | Belgium | 51.37 | 4.52 | 65 | 31916 |
| Ouderzeel | city | Vlaanderen | Belgium | 51.37 | 4.52 | 65 | 31916 |
| Oudeveldstraat | city | Vlaanderen | Belgium | 51.12 | 3.88 | 9 | 21485 |
| 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 |
| Oukne | city | Vlaanderen | Belgium | 50.92 | 3.16 | 75 | 64428 |
| Ouldoumont | city | Wallonie | Belgium | 50.62 | 5.33 | 830 | 17675 |
| Oultre | city | Vlaanderen | Belgium | 50.84 | 4.00 | 65 | 42758 |
| 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 |
| Outave | city | Vlaanderen | Belgium | 51.24 | 3.11 | 3 | 20598 |
| Oute | city | Vlaanderen | Belgium | 51.03 | 4.02 | 9 | 48031 |
| Outer | city | Vlaanderen | Belgium | 50.84 | 4.00 | 65 | 42758 |
| Outgaarden | city | Vlaanderen | Belgium | 50.77 | 4.92 | 262 | 25879 |
| 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 |
| Outrijve | city | Vlaanderen | Belgium | 50.76 | 3.43 | 39 | 16818 |
| Outulst | city | Vlaanderen | Belgium | 50.98 | 2.95 | 62 | 11539 |
| Ouwegem | city | Vlaanderen | Belgium | 50.91 | 3.60 | 68 | 24467 |
| Ouwijk | city | Vlaanderen | Belgium | 50.88 | 4.13 | 62 | 57461 |