| Harper Woods to Orbetello | 4,519.80 mi (7,273.91 km) |
| Harper Woods to Oria | 4,864.46 mi (7,828.60 km) |
| Harper Woods to Oristano | 4,511.74 mi (7,260.94 km) |
| Harper Woods to Orta Nova | 4,750.38 mi (7,644.99 km) |
| Harper Woods to Orte | 4,567.21 mi (7,350.21 km) |
| Harper Woods to Ortona | 4,653.83 mi (7,489.62 km) |
| Harper Woods to Orvieto | 4,545.34 mi (7,315.01 km) |
| Harper Woods to Orzinuovi | 4,350.17 mi (7,000.92 km) |
| Harper Woods to Osimo | 4,569.60 mi (7,354.06 km) |
| Harper Woods to Ospitaletto | 4,349.76 mi (7,000.26 km) |
| Harper Woods to Ostuni | 4,852.17 mi (7,808.81 km) |
| Harper Woods to Ottaviano | 4,720.50 mi (7,596.90 km) |
| Harper Woods to Ovada | 4,327.44 mi (6,964.35 km) |
| Harper Woods to Ozieri | 4,502.02 mi (7,245.29 km) |
| Harper Woods to Paceco | 4,761.56 mi (7,662.99 km) |
