| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Obaix | city | Province de Hainaut | Belgium | 50.5333333 | 4.35 | 459 | 37272 |
| Obelisque | city | Province de Namur | Belgium | 50.3833333 | 5.2833333 | 885 | 5693 |
| Oben Steine Bruck | city | Province de Luxembourg | Belgium | 49.7166667 | 5.7 | 1243 | 7223 |
| Oben Steine Brück | city | Province de Luxembourg | Belgium | 49.7166667 | 5.7 | 1243 | 7223 |
| Obent Steine Bruck | city | Province de Luxembourg | Belgium | 49.7166667 | 5.7 | 1243 | 7223 |
| Obent Steine Brück | city | Province de Luxembourg | Belgium | 49.7166667 | 5.7 | 1243 | 7223 |
| Ober-Emmels | city | Province de Liege | Belgium | 50.2991667 | 6.0891667 | 1709 | 5120 |
| Oberhausen | city | Province de Liege | Belgium | 50.15 | 6.15 | 1610 | 4681 |
| Oberst-Crombach | city | Province de Liege | Belgium | 50.2811111 | 6.035 | 1709 | 4813 |
| Obigies | city | Province de Hainaut | Belgium | 50.6666667 | 3.35 | 59 | 26361 |
| Oborne | city | Province de Liege | Belgium | 50.75 | 5.5333333 | 423 | 47259 |
| Obourg | city | Province de Hainaut | Belgium | 50.4666667 | 4 | 193 | 44968 |
| Obroek | city | Provincie Antwerpen | Belgium | 51.2833333 | 5.0833333 | 72 | 21890 |
| Obsinnich | city | Province de Liege | Belgium | 50.7333333 | 5.8833333 | 698 | 16582 |
| Obélisque | city | Province de Namur | Belgium | 50.3833333 | 5.2833333 | 885 | 5693 |
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