| Clay to Octeville | 4,281.68 mi (6,890.70 km) |
| Clay to Oignies | 4,451.92 mi (7,164.67 km) |
| Clay to Oissel | 4,403.29 mi (7,086.41 km) |
| Clay to Olivet | 4,476.67 mi (7,204.50 km) |
| Clay to Ollioules | 4,788.80 mi (7,706.82 km) |
| Clay to Olonne-sur-Mer | 4,352.08 mi (7,003.99 km) |
| Clay to Oloron-Sainte-Marie | 4,493.70 mi (7,231.91 km) |
| Clay to Onet Village | 4,605.73 mi (7,412.20 km) |
| Clay to Onnaing | 4,478.61 mi (7,207.63 km) |
| Clay to Orange | 4,711.36 mi (7,582.20 km) |
| Clay to Orchies | 4,461.93 mi (7,180.78 km) |
| Clay to Orleans | 4,475.97 mi (7,203.38 km) |
| Clay to Orly | 4,473.57 mi (7,199.51 km) |
| Clay to Ormesson-sur-Marne | 4,478.52 mi (7,207.49 km) |
| Clay to Orsay | 4,466.20 mi (7,187.65 km) |
