| Mechernich to Ottendorf-Okrilla | 315.19 mi (507.25 km) |
| Mechernich to Ottersberg | 203.00 mi (326.70 km) |
| Mechernich to Ottobrunn | 285.65 mi (459.71 km) |
| Mechernich to Ottweiler | 88.25 mi (142.02 km) |
| Mechernich to Overath | 37.30 mi (60.03 km) |
| Mechernich to Oyten | 197.81 mi (318.34 km) |
| Mechernich to Paderborn | 119.50 mi (192.31 km) |
| Mechernich to Papenburg | 173.41 mi (279.08 km) |
| Mechernich to Parchim | 293.93 mi (473.03 km) |
| Mechernich to Pasewalk | 370.78 mi (596.71 km) |
| Mechernich to Passau | 335.63 mi (540.15 km) |
| Mechernich to Pattensen | 176.85 mi (284.61 km) |
| Mechernich to Pegnitz | 224.25 mi (360.89 km) |
| Mechernich to Peine | 194.71 mi (313.36 km) |
| Mechernich to Peissenberg | 277.78 mi (447.04 km) |
