| Grosse Pointe Woods to Orbetello | 4,518.63 mi (7,272.04 km) |
| Grosse Pointe Woods to Oria | 4,863.33 mi (7,826.77 km) |
| Grosse Pointe Woods to Oristano | 4,510.51 mi (7,258.96 km) |
| Grosse Pointe Woods to Orta Nova | 4,749.23 mi (7,643.16 km) |
| Grosse Pointe Woods to Orte | 4,566.05 mi (7,348.35 km) |
| Grosse Pointe Woods to Ortona | 4,652.69 mi (7,487.78 km) |
| Grosse Pointe Woods to Orvieto | 4,544.18 mi (7,313.15 km) |
| Grosse Pointe Woods to Orzinuovi | 4,349.04 mi (6,999.11 km) |
| Grosse Pointe Woods to Osimo | 4,568.47 mi (7,352.24 km) |
| Grosse Pointe Woods to Ospitaletto | 4,348.64 mi (6,998.45 km) |
| Grosse Pointe Woods to Ostuni | 4,851.03 mi (7,806.99 km) |
| Grosse Pointe Woods to Ottaviano | 4,719.33 mi (7,595.03 km) |
| Grosse Pointe Woods to Ovada | 4,326.29 mi (6,962.50 km) |
| Grosse Pointe Woods to Ozieri | 4,500.80 mi (7,243.34 km) |
| Grosse Pointe Woods to Paceco | 4,760.34 mi (7,661.02 km) |
