| Mechernich to Obernburg am Main | 122.01 mi (196.36 km) |
| Mechernich to Obernkirchen | 156.69 mi (252.16 km) |
| Mechernich to Oberschleissheim | 274.11 mi (441.14 km) |
| Mechernich to Oberstdorf | 274.97 mi (442.52 km) |
| Mechernich to Obertraubling | 270.70 mi (435.65 km) |
| Mechernich to Obertshausen | 103.10 mi (165.92 km) |
| Mechernich to Oberursel | 89.17 mi (143.51 km) |
| Mechernich to Ochsenfurt | 164.95 mi (265.46 km) |
| Mechernich to Ochsenhausen | 229.20 mi (368.86 km) |
| Mechernich to Ochtrup | 113.35 mi (182.42 km) |
| Mechernich to Odenthal | 36.21 mi (58.28 km) |
| Mechernich to Oelde | 107.12 mi (172.39 km) |
| Mechernich to Oelsnitz | 242.68 mi (390.56 km) |
| Mechernich to Oer-Erkenschwick | 76.58 mi (123.24 km) |
| Mechernich to Oerlinghausen | 128.49 mi (206.79 km) |
