| North Olmsted to Octeville | 3,739.70 mi (6,018.46 km) |
| North Olmsted to Oignies | 3,900.93 mi (6,277.93 km) |
| North Olmsted to Oissel | 3,859.22 mi (6,210.82 km) |
| North Olmsted to Olivet | 3,937.99 mi (6,337.58 km) |
| North Olmsted to Ollioules | 4,265.01 mi (6,863.86 km) |
| North Olmsted to Olonne-sur-Mer | 3,825.03 mi (6,155.80 km) |
| North Olmsted to Oloron-Sainte-Marie | 3,981.93 mi (6,408.29 km) |
| North Olmsted to Onet Village | 4,082.15 mi (6,569.58 km) |
| North Olmsted to Onnaing | 3,927.24 mi (6,320.29 km) |
| North Olmsted to Orange | 4,184.89 mi (6,734.93 km) |
| North Olmsted to Orchies | 3,910.63 mi (6,293.55 km) |
| North Olmsted to Orleans | 3,937.11 mi (6,336.17 km) |
| North Olmsted to Orly | 3,930.40 mi (6,325.36 km) |
| North Olmsted to Ormesson-sur-Marne | 3,934.98 mi (6,332.75 km) |
| North Olmsted to Orsay | 3,923.49 mi (6,314.25 km) |
