| Simmerath to Oberkirch | 163.63 mi (263.34 km) |
| Simmerath to Obernburg am Main | 136.15 mi (219.11 km) |
| Simmerath to Obernkirchen | 167.28 mi (269.22 km) |
| Simmerath to Oberschleissheim | 286.93 mi (461.77 km) |
| Simmerath to Oberstdorf | 284.73 mi (458.23 km) |
| Simmerath to Obertraubling | 284.96 mi (458.60 km) |
| Simmerath to Obertshausen | 117.65 mi (189.34 km) |
| Simmerath to Oberursel | 103.96 mi (167.31 km) |
| Simmerath to Ochsenfurt | 179.29 mi (288.53 km) |
| Simmerath to Ochsenhausen | 239.70 mi (385.77 km) |
| Simmerath to Ochtrup | 117.39 mi (188.92 km) |
| Simmerath to Odenthal | 46.56 mi (74.94 km) |
| Simmerath to Oelde | 116.93 mi (188.18 km) |
| Simmerath to Oelsnitz | 258.04 mi (415.28 km) |
| Simmerath to Oer-Erkenschwick | 82.98 mi (133.55 km) |
