| Den Helder to Oerlinghausen | 177.91 mi (286.32 km) |
| Den Helder to Oestrich-Winkel | 246.21 mi (396.23 km) |
| Den Helder to Offenburg | 338.51 mi (544.79 km) |
| Den Helder to Oftersheim | 296.91 mi (477.84 km) |
| Den Helder to Ohrdruf | 293.58 mi (472.48 km) |
| Den Helder to Ohringen | 330.11 mi (531.26 km) |
| Den Helder to Olbernhau | 398.46 mi (641.26 km) |
| Den Helder to Olching | 435.54 mi (700.94 km) |
| Den Helder to Oldenburg | 144.62 mi (232.75 km) |
| Den Helder to Oldenburg in Holstein | 268.42 mi (431.97 km) |
| Den Helder to Olfen | 139.38 mi (224.31 km) |
| Den Helder to Olpe | 186.40 mi (299.98 km) |
| Den Helder to Olsberg | 192.39 mi (309.62 km) |
| Den Helder to Oranienburg | 354.18 mi (570.00 km) |
| Den Helder to Ortenberg | 256.41 mi (412.65 km) |
