| Mersch to Octeville | 346.06 mi (556.94 km) |
| Mersch to Oignies | 146.33 mi (235.49 km) |
| Mersch to Oissel | 226.26 mi (364.13 km) |
| Mersch to Olivet | 231.24 mi (372.15 km) |
| Mersch to Ollioules | 456.91 mi (735.32 km) |
| Mersch to Olonne-sur-Mer | 425.18 mi (684.26 km) |
| Mersch to Oloron-Sainte-Marie | 553.61 mi (890.95 km) |
| Mersch to Onet Village | 406.88 mi (654.81 km) |
| Mersch to Onnaing | 119.38 mi (192.12 km) |
| Mersch to Orange | 392.46 mi (631.61 km) |
| Mersch to Orchies | 136.07 mi (218.99 km) |
| Mersch to Orleans | 229.37 mi (369.14 km) |
| Mersch to Orly | 181.06 mi (291.39 km) |
| Mersch to Ormesson-sur-Marne | 173.83 mi (279.75 km) |
| Mersch to Orsay | 190.90 mi (307.22 km) |
