| Sioux City to Octeville | 4,258.38 mi (6,853.20 km) |
| Sioux City to Oignies | 4,394.88 mi (7,072.87 km) |
| Sioux City to Oissel | 4,370.95 mi (7,034.36 km) |
| Sioux City to Olivet | 4,460.43 mi (7,178.37 km) |
| Sioux City to Ollioules | 4,811.82 mi (7,743.87 km) |
| Sioux City to Olonne-sur-Mer | 4,372.89 mi (7,037.49 km) |
| Sioux City to Oloron-Sainte-Marie | 4,553.72 mi (7,328.51 km) |
| Sioux City to Onet Village | 4,632.18 mi (7,454.78 km) |
| Sioux City to Onnaing | 4,419.73 mi (7,112.86 km) |
| Sioux City to Orange | 4,727.95 mi (7,608.90 km) |
| Sioux City to Orchies | 4,403.59 mi (7,086.90 km) |
| Sioux City to Orleans | 4,459.18 mi (7,176.35 km) |
| Sioux City to Orly | 4,442.92 mi (7,150.19 km) |
| Sioux City to Ormesson-sur-Marne | 4,446.57 mi (7,156.07 km) |
| Sioux City to Orsay | 4,437.21 mi (7,141.00 km) |
