| Mersch to Oerlinghausen | 189.68 mi (305.26 km) |
| Mersch to Oestrich-Winkel | 86.35 mi (138.96 km) |
| Mersch to Offenburg | 121.39 mi (195.36 km) |
| Mersch to Oftersheim | 114.40 mi (184.10 km) |
| Mersch to Ohrdruf | 217.61 mi (350.21 km) |
| Mersch to Ohringen | 157.29 mi (253.13 km) |
| Mersch to Olbernhau | 325.92 mi (524.52 km) |
| Mersch to Olching | 259.62 mi (417.82 km) |
| Mersch to Oldenburg | 251.52 mi (404.77 km) |
| Mersch to Oldenburg in Holstein | 374.22 mi (602.25 km) |
| Mersch to Olfen | 147.01 mi (236.59 km) |
| Mersch to Olpe | 116.15 mi (186.92 km) |
| Mersch to Olsberg | 152.20 mi (244.94 km) |
| Mersch to Oranienburg | 371.68 mi (598.17 km) |
| Mersch to Ortenberg | 137.62 mi (221.47 km) |
