| Duluth to Octeville | 3,906.82 mi (6,287.41 km) |
| Duluth to Oignies | 4,039.55 mi (6,501.03 km) |
| Duluth to Oissel | 4,018.06 mi (6,466.45 km) |
| Duluth to Olivet | 4,109.01 mi (6,612.81 km) |
| Duluth to Ollioules | 4,463.93 mi (7,184.00 km) |
| Duluth to Olonne-sur-Mer | 4,026.30 mi (6,479.71 km) |
| Duluth to Oloron-Sainte-Marie | 4,211.99 mi (6,778.54 km) |
| Duluth to Onet Village | 4,285.37 mi (6,896.63 km) |
| Duluth to Onnaing | 4,064.18 mi (6,540.67 km) |
| Duluth to Orange | 4,379.53 mi (7,048.17 km) |
| Duluth to Orchies | 4,048.13 mi (6,514.84 km) |
| Duluth to Orleans | 4,107.69 mi (6,610.69 km) |
| Duluth to Orly | 4,090.01 mi (6,582.23 km) |
| Duluth to Ormesson-sur-Marne | 4,093.51 mi (6,587.87 km) |
| Duluth to Orsay | 4,084.48 mi (6,573.34 km) |
