| Grosse Pointe Park to Oerlinghausen | 4,061.72 mi (6,536.71 km) |
| Grosse Pointe Park to Oestrich-Winkel | 4,105.96 mi (6,607.90 km) |
| Grosse Pointe Park to Offenburg | 4,158.41 mi (6,692.31 km) |
| Grosse Pointe Park to Oftersheim | 4,150.86 mi (6,680.17 km) |
| Grosse Pointe Park to Ohrdruf | 4,178.65 mi (6,724.89 km) |
| Grosse Pointe Park to Ohringen | 4,192.12 mi (6,746.57 km) |
| Grosse Pointe Park to Olbernhau | 4,280.17 mi (6,888.26 km) |
| Grosse Pointe Park to Olching | 4,299.20 mi (6,918.90 km) |
| Grosse Pointe Park to Oldenburg | 4,004.74 mi (6,445.01 km) |
| Grosse Pointe Park to Oldenburg in Holstein | 4,059.50 mi (6,533.13 km) |
| Grosse Pointe Park to Olfen | 4,022.90 mi (6,474.23 km) |
| Grosse Pointe Park to Olpe | 4,063.88 mi (6,540.19 km) |
| Grosse Pointe Park to Olsberg | 4,076.51 mi (6,560.50 km) |
| Grosse Pointe Park to Oranienburg | 4,197.75 mi (6,755.63 km) |
| Grosse Pointe Park to Ortenberg | 4,133.22 mi (6,651.77 km) |
