| River Ridge to Octeville | 4,613.51 mi (7,424.73 km) |
| River Ridge to Oignies | 4,784.88 mi (7,700.52 km) |
| River Ridge to Oissel | 4,735.37 mi (7,620.85 km) |
| River Ridge to Olivet | 4,807.89 mi (7,737.55 km) |
| River Ridge to Ollioules | 5,116.97 mi (8,234.97 km) |
| River Ridge to Olonne-sur-Mer | 4,681.26 mi (7,533.75 km) |
| River Ridge to Oloron-Sainte-Marie | 4,819.43 mi (7,756.12 km) |
| River Ridge to Onet Village | 4,934.00 mi (7,940.51 km) |
| River Ridge to Onnaing | 4,811.61 mi (7,743.53 km) |
| River Ridge to Orange | 5,040.16 mi (8,111.35 km) |
| River Ridge to Orchies | 4,794.92 mi (7,716.68 km) |
| River Ridge to Orleans | 4,807.23 mi (7,736.48 km) |
| River Ridge to Orly | 4,805.50 mi (7,733.70 km) |
| River Ridge to Ormesson-sur-Marne | 4,810.50 mi (7,741.76 km) |
| River Ridge to Orsay | 4,798.06 mi (7,721.73 km) |
