| Hardinxveld-Giessendam to Oerlinghausen | 163.77 mi (263.56 km) |
| Hardinxveld-Giessendam to Oestrich-Winkel | 186.49 mi (300.13 km) |
| Hardinxveld-Giessendam to Offenburg | 269.05 mi (432.99 km) |
| Hardinxveld-Giessendam to Oftersheim | 235.82 mi (379.51 km) |
| Hardinxveld-Giessendam to Ohrdruf | 263.65 mi (424.30 km) |
| Hardinxveld-Giessendam to Ohringen | 273.28 mi (439.81 km) |
| Hardinxveld-Giessendam to Olbernhau | 375.92 mi (604.98 km) |
| Hardinxveld-Giessendam to Olching | 380.96 mi (613.10 km) |
| Hardinxveld-Giessendam to Oldenburg | 169.22 mi (272.34 km) |
| Hardinxveld-Giessendam to Oldenburg in Holstein | 304.06 mi (489.34 km) |
| Hardinxveld-Giessendam to Olfen | 109.25 mi (175.82 km) |
| Hardinxveld-Giessendam to Olpe | 140.58 mi (226.24 km) |
| Hardinxveld-Giessendam to Olsberg | 159.97 mi (257.45 km) |
| Hardinxveld-Giessendam to Oranienburg | 360.83 mi (580.70 km) |
| Hardinxveld-Giessendam to Ortenberg | 209.15 mi (336.60 km) |
