| Grinon to Oerlinghausen | 1,006.33 mi (1,619.54 km) |
| Grinon to Oestrich-Winkel | 887.11 mi (1,427.67 km) |
| Grinon to Offenburg | 813.08 mi (1,308.53 km) |
| Grinon to Oftersheim | 876.30 mi (1,410.26 km) |
| Grinon to Ohrdruf | 1,014.23 mi (1,632.24 km) |
| Grinon to Ohringen | 900.31 mi (1,448.90 km) |
| Grinon to Olbernhau | 1,097.59 mi (1,766.40 km) |
| Grinon to Olching | 929.18 mi (1,495.37 km) |
| Grinon to Oldenburg | 1,057.39 mi (1,701.71 km) |
| Grinon to Oldenburg in Holstein | 1,188.22 mi (1,912.26 km) |
| Grinon to Olfen | 958.01 mi (1,541.77 km) |
| Grinon to Olpe | 933.36 mi (1,502.09 km) |
| Grinon to Olsberg | 969.30 mi (1,559.93 km) |
| Grinon to Oranienburg | 1,182.02 mi (1,902.28 km) |
| Grinon to Ortenberg | 937.71 mi (1,509.11 km) |
