| Grez-Doiceau to Oestrich-Winkel | 154.00 mi (247.83 km) |
| Grez-Doiceau to Offenburg | 213.24 mi (343.18 km) |
| Grez-Doiceau to Oftersheim | 196.35 mi (315.99 km) |
| Grez-Doiceau to Ohrdruf | 263.56 mi (424.16 km) |
| Grez-Doiceau to Ohringen | 238.12 mi (383.22 km) |
| Grez-Doiceau to Olbernhau | 377.63 mi (607.73 km) |
| Grez-Doiceau to Olching | 344.65 mi (554.66 km) |
| Grez-Doiceau to Oldenburg | 223.88 mi (360.30 km) |
| Grez-Doiceau to Oldenburg in Holstein | 357.97 mi (576.10 km) |
| Grez-Doiceau to Olfen | 134.52 mi (216.48 km) |
| Grez-Doiceau to Olpe | 137.99 mi (222.08 km) |
| Grez-Doiceau to Olsberg | 169.77 mi (273.22 km) |
| Grez-Doiceau to Oranienburg | 390.71 mi (628.78 km) |
| Grez-Doiceau to Ortenberg | 192.97 mi (310.56 km) |
| Grez-Doiceau to Oschatz | 367.32 mi (591.14 km) |
