| Merzig to Obernburg am Main | 116.12 mi (186.87 km) |
| Merzig to Obernkirchen | 223.05 mi (358.97 km) |
| Merzig to Oberschleissheim | 239.79 mi (385.90 km) |
| Merzig to Oberstdorf | 219.20 mi (352.76 km) |
| Merzig to Obertraubling | 252.70 mi (406.68 km) |
| Merzig to Obertshausen | 107.72 mi (173.36 km) |
| Merzig to Oberursel | 101.69 mi (163.66 km) |
| Merzig to Ochsenfurt | 155.25 mi (249.86 km) |
| Merzig to Ochsenhausen | 179.10 mi (288.23 km) |
| Merzig to Ochtrup | 192.03 mi (309.04 km) |
| Merzig to Odenthal | 111.60 mi (179.61 km) |
| Merzig to Oelde | 177.84 mi (286.20 km) |
| Merzig to Oelsnitz | 255.64 mi (411.41 km) |
| Merzig to Oer-Erkenschwick | 154.00 mi (247.84 km) |
| Merzig to Oerlinghausen | 195.64 mi (314.85 km) |
