| Merzig to Oestrich-Winkel | 72.54 mi (116.73 km) |
| Merzig to Offenburg | 90.46 mi (145.58 km) |
| Merzig to Oftersheim | 88.64 mi (142.65 km) |
| Merzig to Ohrdruf | 205.61 mi (330.89 km) |
| Merzig to Ohringen | 130.98 mi (210.79 km) |
| Merzig to Olbernhau | 309.45 mi (498.00 km) |
| Merzig to Olching | 230.53 mi (371.00 km) |
| Merzig to Oldenburg | 264.37 mi (425.46 km) |
| Merzig to Oldenburg in Holstein | 381.17 mi (613.44 km) |
| Merzig to Olfen | 160.18 mi (257.79 km) |
| Merzig to Olpe | 120.86 mi (194.51 km) |
| Merzig to Olsberg | 154.88 mi (249.26 km) |
| Merzig to Oranienburg | 366.66 mi (590.08 km) |
| Merzig to Ortenberg | 125.27 mi (201.60 km) |
| Merzig to Oschatz | 313.13 mi (503.94 km) |
