| Grado to Oerlinghausen | 903.37 mi (1,453.83 km) |
| Grado to Oestrich-Winkel | 806.34 mi (1,297.68 km) |
| Grado to Offenburg | 757.54 mi (1,219.14 km) |
| Grado to Oftersheim | 809.78 mi (1,303.21 km) |
| Grado to Ohrdruf | 939.44 mi (1,511.88 km) |
| Grado to Ohringen | 842.75 mi (1,356.27 km) |
| Grado to Olbernhau | 1,038.77 mi (1,671.73 km) |
| Grado to Olching | 898.83 mi (1,446.53 km) |
| Grado to Oldenburg | 938.06 mi (1,509.66 km) |
| Grado to Oldenburg in Holstein | 1,073.13 mi (1,727.04 km) |
| Grado to Olfen | 848.98 mi (1,366.30 km) |
| Grado to Olpe | 836.68 mi (1,346.51 km) |
| Grado to Olsberg | 872.87 mi (1,404.75 km) |
| Grado to Oranienburg | 1,095.95 mi (1,763.76 km) |
| Grado to Ortenberg | 859.10 mi (1,382.59 km) |
