| Grosse Pointe Park to Orbetello | 4,522.19 mi (7,277.77 km) |
| Grosse Pointe Park to Oria | 4,866.94 mi (7,832.59 km) |
| Grosse Pointe Park to Oristano | 4,513.92 mi (7,264.45 km) |
| Grosse Pointe Park to Orta Nova | 4,752.84 mi (7,648.96 km) |
| Grosse Pointe Park to Orte | 4,569.63 mi (7,354.11 km) |
| Grosse Pointe Park to Ortona | 4,656.31 mi (7,493.60 km) |
| Grosse Pointe Park to Orvieto | 4,547.77 mi (7,318.93 km) |
| Grosse Pointe Park to Orzinuovi | 4,352.69 mi (7,004.97 km) |
| Grosse Pointe Park to Osimo | 4,572.11 mi (7,358.10 km) |
| Grosse Pointe Park to Ospitaletto | 4,352.29 mi (7,004.33 km) |
| Grosse Pointe Park to Ostuni | 4,854.66 mi (7,812.82 km) |
| Grosse Pointe Park to Ottaviano | 4,722.90 mi (7,600.78 km) |
| Grosse Pointe Park to Ovada | 4,329.89 mi (6,968.28 km) |
| Grosse Pointe Park to Ozieri | 4,504.25 mi (7,248.89 km) |
| Grosse Pointe Park to Paceco | 4,763.76 mi (7,666.54 km) |
