| Hardinxveld-Giessendam to Oberkirch | 268.54 mi (432.18 km) |
| Hardinxveld-Giessendam to Obernburg am Main | 232.32 mi (373.89 km) |
| Hardinxveld-Giessendam to Obernkirchen | 184.69 mi (297.23 km) |
| Hardinxveld-Giessendam to Oberschleissheim | 387.07 mi (622.93 km) |
| Hardinxveld-Giessendam to Oberstdorf | 389.85 mi (627.40 km) |
| Hardinxveld-Giessendam to Obertraubling | 378.10 mi (608.49 km) |
| Hardinxveld-Giessendam to Obertshausen | 211.96 mi (341.11 km) |
| Hardinxveld-Giessendam to Oberursel | 197.22 mi (317.40 km) |
| Hardinxveld-Giessendam to Ochsenfurt | 273.37 mi (439.95 km) |
| Hardinxveld-Giessendam to Ochsenhausen | 344.30 mi (554.09 km) |
| Hardinxveld-Giessendam to Ochtrup | 103.77 mi (167.00 km) |
| Hardinxveld-Giessendam to Odenthal | 112.27 mi (180.69 km) |
| Hardinxveld-Giessendam to Oelde | 141.63 mi (227.93 km) |
| Hardinxveld-Giessendam to Oelsnitz | 332.28 mi (534.76 km) |
| Hardinxveld-Giessendam to Oer-Erkenschwick | 104.15 mi (167.62 km) |
