| Markham to Octeville | 3,963.95 mi (6,379.36 km) |
| Markham to Oignies | 4,116.31 mi (6,624.57 km) |
| Markham to Oissel | 4,081.20 mi (6,568.06 km) |
| Markham to Olivet | 4,164.23 mi (6,701.69 km) |
| Markham to Ollioules | 4,501.14 mi (7,243.89 km) |
| Markham to Olonne-sur-Mer | 4,060.48 mi (6,534.71 km) |
| Markham to Oloron-Sainte-Marie | 4,226.60 mi (6,802.05 km) |
| Markham to Onet Village | 4,319.04 mi (6,950.82 km) |
| Markham to Onnaing | 4,142.16 mi (6,666.16 km) |
| Markham to Orange | 4,419.45 mi (7,112.42 km) |
| Markham to Orchies | 4,125.67 mi (6,639.63 km) |
| Markham to Orleans | 4,163.21 mi (6,700.04 km) |
| Markham to Orly | 4,152.89 mi (6,683.43 km) |
| Markham to Ormesson-sur-Marne | 4,157.14 mi (6,690.27 km) |
| Markham to Orsay | 4,146.42 mi (6,673.01 km) |
