| Duncan to Octeville | 4,702.61 mi (7,568.12 km) |
| Duncan to Oignies | 4,853.31 mi (7,810.65 km) |
| Duncan to Oissel | 4,819.54 mi (7,756.30 km) |
| Duncan to Olivet | 4,903.05 mi (7,890.70 km) |
| Duncan to Ollioules | 5,239.98 mi (8,432.93 km) |
| Duncan to Olonne-sur-Mer | 4,799.33 mi (7,723.77 km) |
| Duncan to Oloron-Sainte-Marie | 4,963.83 mi (7,988.51 km) |
| Duncan to Onet Village | 5,057.78 mi (8,139.72 km) |
| Duncan to Onnaing | 4,879.02 mi (7,852.02 km) |
| Duncan to Orange | 5,158.40 mi (8,301.64 km) |
| Duncan to Orchies | 4,862.58 mi (7,825.56 km) |
| Duncan to Orleans | 4,902.02 mi (7,889.04 km) |
| Duncan to Orly | 4,891.28 mi (7,871.75 km) |
| Duncan to Ormesson-sur-Marne | 4,895.48 mi (7,878.51 km) |
| Duncan to Orsay | 4,884.87 mi (7,861.43 km) |
