| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Obaix | city | Province de Hainaut | Belgium | 50.5333333 | 4.35 | 459 | 37272 |
| Obigies | city | Province de Hainaut | Belgium | 50.6666667 | 3.35 | 59 | 26361 |
| Obourg | city | Province de Hainaut | Belgium | 50.4666667 | 4 | 193 | 44968 |
| Odomont | city | Province de Hainaut | Belgium | 50.5333333 | 4.3833333 | 439 | 36645 |
| Odoumont | city | Province de Hainaut | Belgium | 50.5333333 | 4.3833333 | 439 | 36645 |
| Oeudeghien | city | Province de Hainaut | Belgium | 50.6666667 | 3.7166667 | 213 | 14936 |
| Offignies | city | Province de Hainaut | Belgium | 50.3833333 | 3.8 | 400 | 70409 |
| Ogy | city | Province de Hainaut | Belgium | 50.7166667 | 3.7666667 | 118 | 18476 |
| Oignies | city | Province de Hainaut | Belgium | 50.4333333 | 4.5833333 | 318 | 67326 |
| Ollignies | city | Province de Hainaut | Belgium | 50.6833333 | 3.85 | 131 | 19070 |
| Ombreucq | city | Province de Hainaut | Belgium | 50.7333333 | 3.7833333 | 141 | 18476 |
| Onnezies | city | Province de Hainaut | Belgium | 50.3666667 | 3.7 | 259 | 24652 |
| Opzullik | city | Province de Hainaut | Belgium | 50.65 | 3.9166667 | 223 | 12557 |
| Orchies | city | Province de Hainaut | Belgium | 50.65 | 3.25 | 98 | 64858 |
| Orcq | city | Province de Hainaut | Belgium | 50.6 | 3.3333333 | 213 | 30152 |
| Ormeignies | city | Province de Hainaut | Belgium | 50.6 | 3.75 | 196 | 15572 |
| Ormont | city | Province de Hainaut | Belgium | 50.6333333 | 3.3666667 | 59 | 25366 |
| Orroir | city | Province de Hainaut | Belgium | 50.75 | 3.4666667 | 62 | 13875 |
| Ossogne | city | Province de Hainaut | Belgium | 50.2833333 | 4.3333333 | 561 | 12516 |
| Ostiches | city | Province de Hainaut | Belgium | 50.6666667 | 3.7666667 | 141 | 17460 |
| Outre Dendre | city | Province de Hainaut | Belgium | 50.6666667 | 3.8 | 98 | 19534 |
| Outre l'Eau | city | Province de Hainaut | Belgium | 50.5166667 | 3.6 | 121 | 28807 |
| Outre l'Eau | city | Province de Hainaut | Belgium | 50.6666667 | 3.6666667 | 367 | 14012 |
| Outre lʼEau | city | Province de Hainaut | Belgium | 50.5166667 | 3.6 | 121 | 28807 |
| Outre lʼEau | city | Province de Hainaut | Belgium | 50.6666667 | 3.6666667 | 367 | 14012 |
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