| South Sioux City to Octeville | 4,260.78 mi (6,857.06 km) |
| South Sioux City to Oignies | 4,397.31 mi (7,076.79 km) |
| South Sioux City to Oissel | 4,373.36 mi (7,038.24 km) |
| South Sioux City to Olivet | 4,462.83 mi (7,182.23 km) |
| South Sioux City to Ollioules | 4,814.18 mi (7,747.67 km) |
| South Sioux City to Olonne-sur-Mer | 4,375.24 mi (7,041.26 km) |
| South Sioux City to Oloron-Sainte-Marie | 4,556.02 mi (7,332.21 km) |
| South Sioux City to Onet Village | 4,634.53 mi (7,458.56 km) |
| South Sioux City to Onnaing | 4,422.17 mi (7,116.79 km) |
| South Sioux City to Orange | 4,730.31 mi (7,612.70 km) |
| South Sioux City to Orchies | 4,406.03 mi (7,090.82 km) |
| South Sioux City to Orleans | 4,461.57 mi (7,180.21 km) |
| South Sioux City to Orly | 4,445.33 mi (7,154.07 km) |
| South Sioux City to Ormesson-sur-Marne | 4,448.99 mi (7,159.95 km) |
| South Sioux City to Orsay | 4,439.62 mi (7,144.87 km) |
