| Grosse Pointe Woods to Oerlinghausen | 4,057.88 mi (6,530.52 km) |
| Grosse Pointe Woods to Oestrich-Winkel | 4,102.19 mi (6,601.83 km) |
| Grosse Pointe Woods to Offenburg | 4,154.69 mi (6,686.32 km) |
| Grosse Pointe Woods to Oftersheim | 4,147.11 mi (6,674.12 km) |
| Grosse Pointe Woods to Ohrdruf | 4,174.82 mi (6,718.72 km) |
| Grosse Pointe Woods to Ohringen | 4,188.36 mi (6,740.51 km) |
| Grosse Pointe Woods to Olbernhau | 4,276.31 mi (6,882.05 km) |
| Grosse Pointe Woods to Olching | 4,295.45 mi (6,912.85 km) |
| Grosse Pointe Woods to Oldenburg | 4,000.86 mi (6,438.77 km) |
| Grosse Pointe Woods to Oldenburg in Holstein | 4,055.56 mi (6,526.79 km) |
| Grosse Pointe Woods to Olfen | 4,019.08 mi (6,468.08 km) |
| Grosse Pointe Woods to Olpe | 4,060.08 mi (6,534.07 km) |
| Grosse Pointe Woods to Olsberg | 4,072.68 mi (6,554.35 km) |
| Grosse Pointe Woods to Oranienburg | 4,193.83 mi (6,749.32 km) |
| Grosse Pointe Woods to Ortenberg | 4,129.42 mi (6,645.66 km) |
