| Harper Woods to Octeville | 3,737.23 mi (6,014.50 km) |
| Harper Woods to Oignies | 3,894.62 mi (6,267.79 km) |
| Harper Woods to Oissel | 3,855.79 mi (6,205.30 km) |
| Harper Woods to Olivet | 3,936.52 mi (6,335.21 km) |
| Harper Woods to Ollioules | 4,268.32 mi (6,869.20 km) |
| Harper Woods to Olonne-sur-Mer | 3,827.86 mi (6,160.34 km) |
| Harper Woods to Oloron-Sainte-Marie | 3,989.44 mi (6,420.38 km) |
| Harper Woods to Onet Village | 4,085.77 mi (6,575.41 km) |
| Harper Woods to Onnaing | 3,920.75 mi (6,309.84 km) |
| Harper Woods to Orange | 4,187.42 mi (6,739.00 km) |
| Harper Woods to Orchies | 3,904.18 mi (6,283.18 km) |
| Harper Woods to Orleans | 3,935.58 mi (6,333.70 km) |
| Harper Woods to Orly | 3,927.23 mi (6,320.26 km) |
| Harper Woods to Ormesson-sur-Marne | 3,931.67 mi (6,327.40 km) |
| Harper Woods to Orsay | 3,920.51 mi (6,309.45 km) |
