| Troisdorf to Octeville | 397.29 mi (639.38 km) |
| Troisdorf to Oignies | 183.90 mi (295.97 km) |
| Troisdorf to Oissel | 287.42 mi (462.56 km) |
| Troisdorf to Olivet | 312.23 mi (502.49 km) |
| Troisdorf to Ollioules | 533.96 mi (859.33 km) |
| Troisdorf to Olonne-sur-Mer | 502.80 mi (809.19 km) |
| Troisdorf to Oloron-Sainte-Marie | 640.39 mi (1,030.62 km) |
| Troisdorf to Onet Village | 493.55 mi (794.30 km) |
| Troisdorf to Onnaing | 158.78 mi (255.52 km) |
| Troisdorf to Orange | 474.15 mi (763.07 km) |
| Troisdorf to Orchies | 172.97 mi (278.36 km) |
| Troisdorf to Orleans | 310.14 mi (499.12 km) |
| Troisdorf to Orly | 256.15 mi (412.23 km) |
| Troisdorf to Ormesson-sur-Marne | 249.08 mi (400.86 km) |
| Troisdorf to Orsay | 265.60 mi (427.45 km) |
