| Marlow to Oerlinghausen | 404.56 mi (651.08 km) |
| Marlow to Oestrich-Winkel | 398.30 mi (641.00 km) |
| Marlow to Offenburg | 441.87 mi (711.12 km) |
| Marlow to Oftersheim | 438.58 mi (705.83 km) |
| Marlow to Ohrdruf | 500.55 mi (805.56 km) |
| Marlow to Ohringen | 481.08 mi (774.23 km) |
| Marlow to Olbernhau | 614.31 mi (988.63 km) |
| Marlow to Olching | 585.80 mi (942.75 km) |
| Marlow to Oldenburg | 394.49 mi (634.88 km) |
| Marlow to Oldenburg in Holstein | 520.28 mi (837.31 km) |
| Marlow to Olfen | 349.98 mi (563.23 km) |
| Marlow to Olpe | 373.89 mi (601.71 km) |
| Marlow to Olsberg | 398.80 mi (641.81 km) |
| Marlow to Oranienburg | 598.72 mi (963.55 km) |
| Marlow to Ortenberg | 435.79 mi (701.33 km) |
